AISI 8620 Tubes Special made by factory for MOQ arrived .

AISI 8620 Tubes Special are a Seamless pipe is a pipe without a seam or a weld-joint. It is alos called CDS pipes (Cold drawn seamless pipe). It’s is used widely in maching parts, shafts, bearings, cylinders having
strength of 75000 PSD tensile. It is a solid carbon steel rod which is pushed on to the mandrel to form the shape of tube .

AISI 8620 Tubes Special is widely used for a variety of applications in the used in the automotive and engineering industries for toolholders and other such components. Typical applications such as valve bodies, pumps and fittings, Shaft, the high load of wheel, bolts, double-headed bolts, gears, etc .

Otai Special Steel  provide AISI 8620 Tubes with any size , MOQ arrived could be customlized , and the price was competitive from Chinese market price .

AISI 8620 Tubes Special made by factory for MOQ arrived .

Otai Special Steel can supply the round bar, steel flat bar, plate, hexagonal steel bar and steel square block . AISI 8620 steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 8620 alloy steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Chemical composition

AISI 8620 Tubes Special made by factory for MOQ arrived .

AISI 8620 Tubes different from other common low carbon steel tubes as 1020 and 1045 tubes , and also have special property different from similar Alloy steel . AISI 8620 Tubes Special made by factory for MOQ arrived . It is a seamless steel pipe/tube is widely used in the mechanical treatment field, petrochemical industry, transport and construction field; A519 8620 used in ordinary structural
purposes and mechanic structural purposes, for example 8620 material used in construction field, fulcrum bearing etc; The transportation of fluids in the projects and big equipments, for
example transport of water, oil, gas etc. A519 8620 seamless pipe/tube can be used in low and medium pressure boiler for the transportation of fluids, for example steam tube, big smoke
tube, small smoke tube, generating tube etc.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

AISI 4130 Qualified Stock from Otai Special Steel  AISI 4130 alloy Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon, Oil Quenched & Tempered Hardenss is 28-34 HRc. AISI 4130 steel Annealing delivery hardenss less than 250HB . OTai have many stock with round bar and original sheet plate , the price are competitive all over the year .

AISI 4130 Qualified Stock from Otai Special Steel  / Otai Special Steel . AISI 4130 steel is widely used for a variety of applications in the oil and gas sector. Typical applications such as valve bodies, pumps and fittings, Shaft, spindle, and the high load of wheel, bolts, double-headed bolts, gears, etc .

AISI 4130 Qualified Stock from Otai Special Steel /  Otai Special Steel . AISI 4130 alloy steel round bar and flat sections can be cut to your required sizes. 4130 alloy steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. AISI 4130 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes .

My cutomer from U.S.A need a very big round bar forged to make a rotor , The alloy is 4130 and heat treated to Yield strength of 1120 MPa , Ultimate strength of 1260 MPa , minimum elongation of 6% ,

Thickness = 475 mm (thickness direction is same as blank thickness direction shown in above figure)

Length = 280 mm

Width = 280 mm

For this samples , we have 9 pcs Dia.2110*L580MM Forged round bar orders , and they have used on the fittings of Oakland Machine Works for more than one year , and my customer was very satisfied with the best quality production , and we also happy that we could provide this very complex fitting to them . The next story may with you , waiting for your new inquiry !

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

Since 2018, OTAI focus on high quality CrNiMo steel, we keep daily stock 500 to 800 tons Steel 34CrNiMo6. All material directly from top 3 China steel mill. That’s why we can support you quickly shipping time, full size, and stable quality. That’s why we have 80% repeat order rate.

Continued

Last article tell the story Asia customer Mr J questioned OTAI did not supply steel 34CrNiMo6 Q+T condition from data of SGS report. I did not reply him that moment.

Next day, when I back to office, I carefully checked BS EN 10343-2009 standard and our steel 34CrNiMo6 SGS report, then understand what happened. If you study this material deeply, you will also have an idea what happened. I paste below email to explain the reason.

Quite appreciate you check my email and SGS report carefully. I guess you should ignore different diameter, different tensile strength standard after QT, and did not noticed I sent you two SGS report for different diameter. Please check attached BS EN 10343-2009 standard and machanical properties table. Our customer purchased Φ55mm,Φ210mm, Φ230mm from us.  

• Φ55mm, tensile strength in standard is 1000-1200MPa, our SGS test result is 1154MPa. Please check table 1.

• Φ210mm&Φ230mm, tensile strength in standard is 800-950MPa, our SGS test result is 936MPa. Please check table 2.

This shipment is absolutely Q+T FOR SURE. Please do not worry about this grade, all our stock is from top 3 China mill, quality is very stable.

What happened next step? You will have conclusion. Yes, Mr J admit he read my email very fast and ignore the material diameters. Mr J decide one container trail order steel 34CrNiMo6 in January 2020. That’s really good beginning in the new year 2020. Looking forward the new business with Mr J.

Ms Susie Li

Mobile/WhatsApp: 0086-13826999755

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Susie@otaisteel.com

The quenching crack of mould steel defects：1.shape effect.2.Overheat.3.Decarbonization.4.Improper cooling5.Poor organization of raw materials

The quenching crack of mould steel defects

Causes of quenching and preventive measures are as follows:

1. Shape effect.It is mainly caused by design,such as too small rounded Angle R, improper hole location and bad section transition.
2. Overheat (overheat).It is mainly caused by temperature control inaccuracy or running temperature, process setting temperature is too high, furnace temperature is not equal factors, preventive measures include: maintenance, proofreading temperature control system, correction process temperature, in the workpiece and the bottom plate of the furnace pad, etc.It also cause the crack of mould steel defects
3. Decarbonization.Mainly caused by overheating (or over burning), unprotected heating of the air furnace, small machine allowance, forging or preparation heat treatment residual decarburization layer and other factors, the preventive measures are: controlled atmosphere heating, salt bath heating, vacuum furnace, box type furnace use packing protection or use anti-oxidation coating;Increase machining allowance by 2-3mm.
4. Improper cooling.It is mainly caused by improper coolant selection or supercooling, should master the cooling characteristics of the quenching medium or tempering treatment.
5. Poor organization of raw materials.If the carbide segregation is serious, the forging quality is poor, the preparation heat treatment method is not appropriate, the preventive measures are: adopt the correct forging technology and the reasonable preparation heat treatment system。
Here is some of the mould steel defects，I would like to suggest you to contact me to know more about mould steel,such as 1.2738–1.2344–D2，It will help you with avoiding much trouble.

And I would like to share some chemical information for your reference.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

Since 2018, OTAI Steel focus on high quality CrNiMo steel, we keep daily stock 500 to 800 tons 34CrNiMo6 steel. All material directly from top 3 China steel mill. That’s why we can support you quickly shipping time, full size, and stable quality. That’s why we have 80% repeat order rate.

Saudi Arabia Case for 34CrNiMo6 steel

This April, OTAI Steel signed contract with Saudi Arabia tender project which use OTAI 34CrNiMo6 steel. This project is proceed by one of our Asia customer, ender user is a Saudi Arabia tender project. The project will last 3 years. Our customer win the bid for material 34CrNiMo6 steel and 1045 steel. We supply 34CrNiMo6 steel to them, dimension is Φ55mm,Φ210mm, Φ230mm. The first stage they order 9 containers to us, split to 3 batch, 3 containers each batch, each batch they require SGS inspection on site, and inspection standard is EN BS 10343-2009. We finished all three batch this November, each batch fully meet EN BS 10343-2009 standard after SGS inspection.

Story about 34CrNiMo6 steel SGS inspection report

Above mentioned SGS report authority proved our material do not have any quality problem to meet Europe standard, what we provide is China price, Europe quality. For the customer who have quality concern about OTAI material, I will share with them this series SGS report.

This October, OTAI visit one Asia country, to visit our old friend, also explore our business there. Mr J is OTAI Steel’s old friend, who worked for professional steel distributor in Moscow. Mr J’s company purchase tool steel Cr12MoV from us regularly recent years. From the visit, we got know, his company also purchase 34CrNiMo6 steel, but from Europe. We do not talk too much about 34CrNiMo6 steel during the meeting, for above mentioned quality concern.

After back to China, I provide Mr J official quotation. He felt price is attractive, but still no further actions. Then I shared the SGS report and on site inspection photos. That night, I received his email. He seriously point out: According to the report, our material sent to Saudi Arabia project is not Q+T, if Q+T, the tensile strength must be min 1000 MPA, and two heat data is below 1000 MPA. Mr J is very professional at this field, he works as engineer at before. I am not an engineer, can  not explain clearly that moment, but I am sure our 34CrNiMo6 steel have no any problem.

To be continued……

Ms Susie Li

Mobile/WhatsApp: 0086-13826999755

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Susie@otaisteel.com

3D printing technology has been out for many years, and I don’t know why it has been so hot recently! 3D printing is a promising technology. We need to treat it correctly. There is no need to exclude it, but it cannot be confused by some artifacts …

In recent years, 3D printing technology has been hyped up. Experts talk about the magic of 3D printing products and declare that the mold steel material industry is in the dead end. What do you think of 3D printing technology?

why do we as steel professionals listen to certain boasts? They don’t even know what the mold steel material is, they just talk about it when they see that 3D printing can make a product. The significance of industrial molds is to achieve high-volume and efficient production, and greatly reduce the production of finished products. 3D printing currently only solves the production of a small number of samples, and its efficiency and cost are not a level compared with mold production.

Although, 3D printing has brought innovation and vitality to the mold manufacturing industry. Because the trial product can be obtained and confirmed in advance through 3D printing, this reduces repeated mold changes after mold opening and the failure of the mold project.

some publicity claims that 3D printing can directly print molds, that is just to show you the principle of presenting molds. It should be said to be a “model”. You can use this model to make some products, but can it be mass-produced. So the mold steel material industry plays an irreplaceable role in mold contribution. 3D printing technology has been out for many years, and I don’t know why it has been so hot recently! 3D printing is a promising technology. We need to treat it correctly. There is no need to exclude it, but it cannot be confused by some artifacts …

Introduction of Otai Steel

Otai Steel supplies a wide range of carbon, alloy, and stainless steel products, including high-speed tool steel, cold works tool steel, hot works tools steel, plastic mold steel, engineering steel and machine structural steel, etc. After almost 20 years of development and growth, Otai Steel becomes one comprehensive special steel factory, stockist and exporter.Combined with the experienced exporting team and professional technical knowledge, Otai Steel offers both technical advice and support, as well as global professional steel solution and service. Due to satisfactory reliable quality and professional service, Otai expands our market worldwide, such as UAE, Canada, Brazil, Colombia, Chile, Spain, Turkey, Algeria, Vietnam, Malaysia and so on. Welcome to send me inquiry.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

1.2311-P20-3Cr2Mo3  www.otaisteel.com

¡Buenos días!

¿Qué haces todos los días?

Hoy escribo una artículo de acero 1.2311-P20-3Cr2Mo3.www.otaisteel.com

1.2311-P20-3Cr2Mo3  www.otaisteel.com

¿Qué es el Acero P20?

El acero P20 tiene muchas propiedades excelentes. En el estado previamente endurecido, el molde se puede procesar sin ningún tratamiento térmico. Lo que reduce el período de ejecución y mejora la eficiencia. Y también se llama DIN 1.2311 y acero SCM4. Después de haber sido procesado a través del forjado, el acero 1.2311 se vuelve denso. Entonces puede pasar la prueba ultrasónica al 100% Y después de la prueba, no quedarán poros ni defectos. P20 herramienta composición química de acero y más información como a continuación.

CARACTERÍSTICAS

El acero SISA P20 pre-templado es de uso general para la fabricación de moldes. Utilizado para el maquinado y electro-erosionado de moldes de plástico y componentes para la fundición de zinc. Se surte pre-templado a una dureza estándar de aprox. BHN 293-321 (HRC 30-34). Normalmente no requiere un tratamiento térmico adicional, sin embargo el acero SISA P20 se puede templar a durezas mayores para incrementar su resistencia. Cuando enfriamiento al aceite es requerido, cuidado especial es necesario para reducir la distorsión o fractura. Provee excelente pulibilidad y buen texturizado.

TRATAMIENTO TÉRMICO Recocer Calentamiento a 790-815°C (1450-1500°F), mantener 2 horas, enfriamiento lento no mayor de 30°C (50°F) por hora hasta alcanzar 650-675°C (12001250°F), mantener hasta normalizar, posterior enfriamiento al aire. Dureza en Estado Recocido BHN 187/223 Relevado de Tensiones Material Recocido: 650-675°C (1200-1250°F) Mantener 2 horas después de calentamiento al núcleo, enfriamiento lento en horno o al aire. Dureza Estándar (BHN 293-321): Calentar a 480°C (900°F), mantener 2 horas después de calentamiento al núcleo. Material Templado Calentar 15-30°C (25-50°F) por debajo de la temperatura de revenido, mantener 2 horas después de calentamiento al núcleo, enfriamiento lento en horno o al aire. Recomendable para reducir las tensiones causadas por un extenso maquinado en caso de herramientas de configuración complicada y para reducir las tensiones después de un proceso de electro-erosión. TEMPLE El acero SISA P20 se surte pre-templado y un tratamiento térmico posterior generalmente no se requiere. Sin embargo, se puede templar a durezas más altas. Nota: El acero SISA P20, debe ser recocido antes de un temple posterior. Precalentar 675-735°C (1250-1350°F), normalizar. Temple (Austenización) 815-845°C (1500-1550°F) – Mantener 30 a 45 minutos a temperatura. Enfriamiento Al aceite a 65-95°C (150-200°F). Revenir inmediatamente. Revenir Doble revenido a 205- 650°C (400-1200°F), mantener 1 hr. por pulgada de espesor (25 mm), 2 hrs. mínimo por revenido.

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839

Email: Jack@otaisteel.com

AISI 8620 STEEL -1.6523-21NiCrMo2-SNCM220  www.otaisteel.com

Todas las mananas , en mi casa , cuando nos levantamos , si repite la misma situacion .

Así empieza todo .

¿Qué haces todos los días?

Escribo una artículo toda la mañana y cemo a las 12.00 por la tarde .

Hoy escribo una artículo de acero 8620.

AISI 8620 STEEL -1.6523-21NiCrMo2-SNCM220   www.otaisteel.com

AISI 8620 STEEL -1.6523-21NiCrMo2-SNCM220  www.otaisteel.com

CARACTERÍSTICAS

Acero grado maquinaria al Níquel-CromoMolibdeno para cementado. Ofrece muy buena dureza superficial y gran tenacidad al núcleo. El proceso de cementado se aplica para incrementar el contenido de carbón en la superficie para que con un tratamiento térmico adecuado, la superficie sea substancialmente mas dura que el núcleo.

AISI 8620 STEEL -1.6523-21NiCrMo2-SNCM220

TRATAMIENTO TÉRMICO Forjar 1050-850°C (1920-1560°F) No forjar por debajo de 825°C (1520°F), enfriamiento lento en horno o material termoaislante. Recocer Calentar a 870°C (1600°F), mantener 2 horas, enfriamiento lento de 30°C (50°F) por hora hasta 650°C (1200°F), dejar enfriar en el horno o en aire quieto a temperatura ambiente. Dureza en Estado Recocido Aprox. BHN 143/163 Relevado de Esfuerzos Piezas Recocidas: Calentar a 1100-1300°F (595-740°C), mantener 2 horas, dejar enfriar en aire quieto. Piezas Templadas: Calentar a 30-55°C (50-100°F) debajo de la temperatura original de revenido, mantener 2 horas, dejar enfriar en aire quieto. Enderezado: Recomendable hacerlo entre 205-425°C (400-800°F) CEMENTAR – Carburizado En caja o en sales a la profundidad deseada a 880-925°C (1615-1700°F). Enfriamiento en aceite o al ambiente. Revenir inmediatamente. Revenir Durante 1 hora mínimo a 150-260°C (300-500°F). El proceso de cementado se aplica para incrementar el contenido de carbón en la superficie para que a través de un tratamiento térmico adecuado, la superficie cementada se vuelve substancialmente mas dura que el núcleo. El proceso combinado de carburizar y de templar por medio del tratamiento térmico es generalmente conocido como “cementado”. El proceso de tratamiento térmico es seleccionado para cada aplicación en particular, de acuerdo a las propiedades requeridas tanto en la superficie como en el núcleo. Aunque existen muchos tratamientos térmicos para los aceros de cementado, los siguientes tratamientos son algunos de los típicamente usados.

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839

Email: Jack@otaisteel.com

Cr12MoV steel has high hardenability. The cross section is 300~400mm. It can be completely hardened. It can still maintain good hardness and wear resistance at 300~400℃.

Cr12MoV can be used to make a variety of molds and tools with large cross-sections, complex shapes and withstanding large impact loads. It is characterized by high wear resistance, hardenability, micro-deformation, high thermal stability, and high bending strength. It is second only to high-speed steel. And Cr12MoV is an important material for a die, cold heading. The consumption ranks first among cold-worked die steels.

In fact, the Chinese market is a mixed and confused. Some unreliable suppliers may be in order to earn high profits, completely disregard and did not consider for the customers at all. And deceive customers with the bad quality. These dishonest behaviors not only disrupt the market. At the meanwhile, it has brought a serious impact on themselves, especially on the end user.

The consequences of purchasing these crudely fabricated Cr12MoV cold work tool steel for end-user are:
1) The microstructure of inferior Cr12MoV die steel is severely segregated. Causes poor processing performance, often encountered difficulties in drilling and tapping.
2) The heat treatment has a large amount of deformation, a high risk of cracking and bending occurs from time to time. It cannot guarantee the stability of the mold size, affect the appearance and even die scrap.
3) The scrap steel refurbished Cr12MoV mold steel has a lot of impurities. It causes the mold to have poor red hardness at high temperatures. The mold hardness decreases quickly, and the knife edge is easily worn.
4) The purity of the mold steel is poor, and there are many non-metallic inclusions. It results in poor impact toughness of the mold, and the knife edge is easy to collapse and drop.

Therefore, we OTAI Special Steel hereby call and expect that all the suppliers can treat every customer honestly. Be responsible to our products, to our reputation and to our customers in the end. Quality should be the basis for all our suppliers to survive. This is the only way we all suppliers can fly higher and go further and farther on this steel road!

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Phoenix@otaisteel.com

What are the characteristics of H13 die casting molds？Mr Chen asked me today.

I told him,H13 is a very representative hot-making mold steel. It is widely used in die casting molds. The operating temperature below 600 degrees, the comprehensive performance is good,and the heat resistance is strong, and it can be water cooled directly , Heat treatment hardness up to HRC50-54, excellent toughness, suitable for all hot-working die-casting molds, mainly used for 50,000 times molds, aluminum alloy die-casting molds, all of the zinc alloy die casting molds, requiring long service life.wear-resistant plastic molds, All wear-resistant parts that require high-temperature operation.

If you wanna know more about material of die casting molds,please click our link- Die casting molds ,or see information as below,

Related Specifications ASTM A681-1999    H13 Tool Steel data files Down

1. AISI H13 tool steel Chemical composition

2. AISI H13 tool steel Form of Supply

we can supply the round bar, flat bar, plate and square block. round bar can be sawn to your required lengths as one offs or multiple cut pieces. Steel plate and sheet rectangular pieces can be sawn from flat bar ,sheet or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Surface Finish: Black, Rough Machined, Turned or as per given requirements.

3. Applications of AISI H13 Tool Steel

H-13 Tool Steel is used in hot forging dies, hot forging die inserts, hot gripper dies, hot nut tools, hot header dies, brass forging and pressing dies, hot forging aluminum base dies, aluminum casting and extrusion dies, zinc die casting dies, extrusion mandrels, plastic molds, cores, die holder blocks, hot press dies, hot work punches, etc.

4. AISI H13 Steel Forging

For forging H13 tool steel, first slowly Preheat to 750°C(1382°F), soak enough time, then rapidly heat to 1050-1100 °C(1922-2030°F). then start forging, ensure the forging temperature higher than 850°C(1562°F).  Cool H13 tool steel must be slowly after H13 steel forging finished.

5. Annealing of Tool Steel H13

Heat to 840-860°C(1544-1580°F), Soak thoroughly before furnace cool at a maximum rate of 20°C(68°F) / hour, Cool down to 600°C (1112°F). Then cool in air.

6. Stress Relieving

Befor make products, The Tool steel stress relieving is very necessary.  When H13 tool steel is ground , heavily machined, cutting,milled , the relief of internal strains is necessary before hardening to minimise the possibility of distortion. for stress relieving, heat the H13 steel component to 700°C(1292°F) carefully, Get  enough soaking period . Then cool in the furnace or cool in air.

7. Hardening

first should preheat the H13 tool steel parts to 780-820°C(1436-1508°F), Soak enough time, ensure soak thoroughly. then rapidly heat to 1000-1030°C(1832-1886°F), soak about 30 mins. cool in air or oil.

8. Tempering

Heat the H13 tool steel parts to tempering temperature, soak enough time until to Soak thoroughly.  The usual tempering temperature range is 400-650°C(752-1202°F), It depend on the tools hardness require and the operating temperature.  H13 tempering data for your reference as below:

9. Nitriding of H13 tool steel

On some special tool require,  the higher hardness is required.  Nitriding the H13 steel can get a hard surface case. after Nitriding , the H13 hot work tool steel will  have a resistant to wear and erosion surface. Typical Nitriding data for your reference as below:

What are the characteristics of H13 die casting molds？Mr Chen asked me today.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com