Category Archives: Blog

Posted

January 10, 2020 at 10:00 am

4140 Round Bar Q+T, the last shipment before this CNY holiday

4140 Round bar Q+T is a alloyed steel for beneficiation that has medium hardness, reaching good tempered layer depth. It is a steel suitable for severe fatigue, impact and stress applications at high temperatures. It is widely used in the oil, steel and capital goods industries.

We could make the different finishes for the 4140 Round Bar Q+T: like as Laminated, forged, drawn and peeled.

From the next week 18th,Jan, our company is closed for the Chinese New year holiday, we will resume to work on 3rd-Feb. Today, I am arranging the last shipment for the 4140 Round Bar Q+T before this CNY holiday.The client is very much appreciated for my kind help on rushing for this 4140 Round Bar Q+T goods. And I finally can go to my hometown for enjoying my long vacation without any worry. Each year, I really enjoy having a big meal with my family. And then watching the Spring Festival gala and visiting all my relatives also make me happy and relaxed.It’s so important for all Chinese people, we have to come back to hometown no matter how difficult it is.It is a family tradition and culture.I do love to share my happiness with my dear clients after come back from CNY holiday.

Here I am also much grateful for my customers’ support during 2019. I am so happy to see they have good benefits from us. As Many customers have found major benefits in sourcing from OTAI Special steel rather than direct from a Chinese mill. These benefits include time saving, reduced costs and flexibility. And we could make the possibility to make regular changes. For example in scheduled quantities, keeping abreast of technology changes, assistance with design and technical issues, all without sacrificing choice or quality. What’s more, OTAI’s purchasing power combined with in-depth knowledge of each mill’s strengths and specialities. It means all this is achieved at a very competitive price and the guaranteed quality.

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Sharon

Posted

January 10, 2020 at 3:16 am

42CrMo4 Round Bar Q+T

A close friend who always buy 42CrMo4 Round Bar Q+T from my company,I still remember the beginning of our cooperation.

A close friend who always buy 42CrMo4 Round Bar Q+T from my company,I still remember the beginning of our cooperation. At the beginning of that period,our delivery day of 42CrMo4 Round Bar Q+T is very very slow,around 30days for processing. In a general way,there no Q+T condition in stock,most of them is Hot roll black surface,forged black surface.so we have to take our goods to the heat treatment factory,as the we know the heat treatment factory is stable and have good repitation,but their delivery time is very slow,and the heat treatment fee is also expensive.sometimes I lost the orders of 42CrMo4 Round Bar Q+T because of delivery days,my friend really want to gave me those order,but he can not wait such long time,as most of his orders are so urgent.

The most important is about staff

After a year,finally,we found another heat treatment factory,and their delivery time for us only need 7 days,we gave them a small order for testing,and the hardness was also met our requirement.and we also sent our engineer to check theirmechanical equipment,and the most important is about staff,our enigneer asked a lot of question of technology,their worker are knows the technology well,and some of them are experienced.

Since we have cooperated several times, we have replaced most of the heat treatment work with them, such as Q+T, annealing and normalization.They never let us down.

If you want to know more about 42CrMo4 Round Bar Q+T,please click the link or contact me.

Mechanical properties of steel 42CrMo4 (1.7225)

Nominal diameter (mm):	to 16	16 – 40	40 – 100	100 – 160	160 – 250	250 – 330	330 – 660
Rm – Tensile strength (MPa) (+QT)	1100-1300	1000-1200	900-1100	800-950	750-900	700	600

Nominal thickness (mm):	0.3 – 3
Rm – Tensile strength (MPa) (+A)	620

Rm – Tensile strength (MPa) (+AC)

630

Nominal thickness (mm):	to 8	8 – 20	20 – 50	50 – 80
Rm – Tensile strength (MPa) (+QT)	1100	1000	900	800

Rm – Tensile strength (MPa) (+C)

720

Rm – Tensile strength (MPa) (+LC)

670

Nominal diameter(mm): or for flat products thickness: to 8; 8-20; 20-60; 60-100; 100-160;	to 16	16 – 40	40 – 100	100 – 160	160 – 330	330 – 660
Re – Upper yield strength or R_p0.2 – 0.2% proof strength (MPa) (+QT)	900	750	650	500-550	460-500	390

Nominal thickness(mm):	0.3 – 3
R_p0.2 0.2% proof strength (MPa) (+A)	480

KV – Impact energy (J) longitud., (+QT)

+20°
30-35

KV – Impact energy (J) transverse, (+QT)

+20°
22

Nominal thickness (mm):	0.3 – 3
A – Min. elongation Lo = 80 mm (%) (+A)	15

A – Min. elongation at fracture (%) transverse, (+QT)

10-14

A – Min. elongation at fracture (%) (+C)

A – Min. elongation at fracture (%) (+LC)

Nominal thickness (mm):	to 16	16 – 40	40 – 100	100 – 160	160 – 250
A – Min. elongation Lo = 5,65 √ So (%) (+QT), round products	10	11	12	13	14

Nominal diameter (mm): or for flat products thickness: to 8; 8-20; 20-60; 60-100; 100-160;	to 16	16 – 40	40 – 100	100 – 160	160 – 250
Z – Reduction in cross section on fracture (%) (+QT)	40	45	50	50	55

Z – Reduction in cross section on fracture (%) (+AC)

Brinell hardness (HBW): (+S)	255
Brinell hardness (HBW): (+A)	241
Vickers hardness ( HV): (+A)	195
Vickers hardness ( HV): (+QT)	340 – 490

Ms Sharon Wan

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Posted

January 10, 2020 at 2:37 am

H13 STEEL APPLICATION IN LIFE-Chapter 3

The force to move the tip/particle away from the surface was recorded. Toner particles were nanotextured to various degrees by mixing with fine SiO₂ particles (mean diameter of 20 nm) which adhered to the toner particles. As the fractal dimension increased, the shearing and adhesion force between particles was also seen to increase.

Mateˇjka et al. examined the wear characteristics of SiC-reinforced iron-phenolic based brake disks using an AFM [16]. Abrasives, such as SiC, are added to brake disk composites in order to increase the friction coefficient and stabilize it at higher temperatures. At temperatures above 250°C an enhanced pull-out of SiC was noted from the AFM results. The AFM results also showed that these particles could help maintain the friction coefficient at higher temperature due to their abrasion of the disk surface. A potential drawback of quicker abrasion of the contact surface was also reported. An optimum of approximately 3.4% SiC addition was determined from this work.

Tool steel – H13

H13 is a hot work tool steel that has good resistance to thermal fatigue, erosion and wear, and is widely used for making molds and dies. The H13 powder used for laser consolidation contains 0.42% C, 5.04% Cr, 1.33% Mo, 1.06% V and 0.88% Si. LC H13 samples were metallurgically sound and free of cracks or porosity. LC H13 tool steel showed directionally solidified dendritic microstructure with layered features: very fine columnar dendrites (around 1–2 μm in dendritic arm spacing) aligned along vertical direction (Fig. 17.4(a)). Cellular features were observed along the transverse cross-section.

The XRD results indicated that the LC H13 steel consisted of a majority of α (martensite) plus trace amount of γ phase (Fig. 17.4(c)), which was very similar to the H13 powder used for the consolidation with the exception of the reduced amount of γ phase. Further XRD analysis indicated that the carbides extracted from LC H13 material were of MC, M₇C₃ and possible M₃C types.

The LC H13 tool steel showed excellent tensile properties (Table 17.2). The average yield and tensile strengths of the as-consolidated H13 along vertical direction were about 1288 MPa and 2064 MPa respectively, while the elongation was about 6% and the elastic modulus (E) was about 216 GPa. Along the horizontal direction, the LC H13 showed significantly higher yield strength (1564 MPa) than along the vertical direction, while the tensile strength, elastic modulus and elongation of LC H13 were comparable for both directions. It should be noted that the tensile properties of the LC H13 material had relatively small scatter. For example, along the vertical direction, the standard deviations of the yield strength and tensile strength were about 54 MPa and 51 MPa respectively, while the standard deviations of the elastic modulus and elongation were 4 GPa and 2.2% respectively, which indicated that the laser consolidated H13 material had a reasonably good consistency.

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Posted

January 10, 2020 at 2:35 am

H13 STEEL APPLICATION IN LIFE-Chapter 4

Compared to the conventional cast or wrought material, the LC H13 tool steel demonstrated excellent tensile properties. From the references,22–24 the yield and tensile strengths of the annealed cast or wrought H13 were about 370–510 MPa and 670 MPa respectively, while the yield and tensile strengths of the wrought H13 in hardened condition were in the range of 1290–1570 MPa and 1500–1960 MPa, respectively. The tensile and yield strengths of the as-consolidated H13 were substantially higher than the annealed cast or wrought H13, and comparable to the hardened wrought H13. The elastic modulus of the as-consolidated H13 was about the same as the wrought material. However, the elongation of as-consolidated H13 material was about 5–6%, which was lower than the hardened wrought H13. A post heat treatment might be used to improve the elongation of the LC H13 material if required.

The LC H13 showed very good wear resistance. The pin-on-disk wear test results indicated that, under the given test conditions (3.175 mm diameter Cr steel ball of Rc.63; 250 g test load; total 4000 m sliding distance), as-consolidated H13 specimens showed significantly improved wear resistance as compared to hardened wrought H13 specimens. For example, the average volume loss of the as-consolidated H13 specimens was about 0.14 mm3, which was only about 1/3 of the volume loss of the hardened H13 tempered at 482 °C (0.4 mm3) and about one order of magnitude less as compared to the annealed wrought H13 material (1.45 mm3). In addition, the average wear volume loss of Cr steel balls tested against the LC H13 specimens (0.21 mm3) was also significantly less (only 1/3 to 1/4) than that of the balls tested against the hardened or annealed wrought H13 specimens (0.56–0.88 mm3).

Otai special steel –www.otaisteel.com

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Monica

Posted

January 10, 2020 at 2:21 am

Din S6-5-2 Round Bar Annealed

Din S6-5-2 Round Bar Annealed from China . In the new year of 2020 . Otai Special Steel still stand here to provide any kinds of Special Steel to the client from all over the world . In the first month of 2020 .

We have sales promotion of Din S6-5-2 Round Bar Annealed . This HIGH-SPEED TUNGSTEN-MOLYBDENUM STEEL the same as of W-Nr. 1.3343 . American standards AISI M2 ACCORDING TO ISO 4957 . German standards DIN 17350 . Japanese standards SKH9 . GOST standards P6M5 . Other standards please special ordered .

Din S6-5-2 Round Bar Annealed have total weights : 300 Tons . Mixed different size from 20 to 180MM . And less sheet plate in our warehouse prepare to sells . Please notice that all the stocklist are limited . If the cargoes sold out . The price will restore to market price .

Din S6-5-2 Round Bar Annealed . It is High-speed steel with very good efficiency . ductility . resistance to abrasion and torsion . And impact strength used to work with products with a strength of more than 830 MPa . It is used in the production of drills . blades . knives . spiral drills . thread cutting tools . broaching tools , gear tools , milling cutters . mandrel reamers , end milling cutters , and circular saw segments . W-Nr. 1.3343 is prone to decarburization and overheating during heat treatment . After hardening and tempering , it achieves hardness above 63 HRC .

All the stocklist in Otai Special Steel’s warehouse . Din S6-5-2 High Speed tool steel round bar and flat sections can be cut to your required sizes . Din S6-5-2 High Speed ground steel bar can also be supplied . Will providing a high quality tool steel precision ground tool steel bar to your required tolerances . Din S6-5-2 High Speed steel also is available as Ground Flat Stock / Gauge Plate . It is up to you the size in standard and nonstandard . We may leave for Chinese Spring Festival holiday in one week . Any new inquiry , please contact with us as soon as possible .

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Jack Otai

Posted

January 9, 2020 at 8:12 am

4140 Shaft Annealed, Otai devotes to satisfied the demand of the customer.

4140 Shaft Annealed is chromium-molybdenum alloy steel. 4140 Shaft Annealed is the main product of Otai special company。

We hold the annual party yesterday, to celebrate the end of 2019, and prepare for 2020, all members of Otai special company enjoy the supper together at the wenhua hotel.

After concluded the work of 2019, we set the new goal of 2020 .during the party time, everyone enjoyed the happy time, we played the games, enjoyed the delicious food. I felt otai steel company is not only a company but also is a big family .once I face the difficulty, my colleagues help me, everyone is easy –going, most of my colleagues worked many years at Otai steel company, so most of our customers are old customer, we achieved a lot of improvements last year, I think we can go further at 2020.

4140 Shaft Annealed is chromium-molybdenum alloy steel. 4140 Annealed is often used when high tensile strength or toughness is required. 4140 Annealed will have a hardness in the high teens/low twenties on the Rockwell C Scale.

application of 4140 Shaft Annealed

4140 is used for engineering structural, like high tensile shafts, bolts, and nuts, gears, pinions, and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of the connecting rod and a spring clip,4140 can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool and can be used for bending machine mold, etc. Thanks for all the customers from all over the world still stand by Otai Special Steel to support us. Never change like steel.

4140 Shaft Annealed is the main product of Otai special company, 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 stocks4140 steel plates and keep a daily inventory of 800 tons which is hard for competitors.

Mr Jack Tan

Tel: 0086-769-23190193

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Sharon

Posted

January 9, 2020 at 3:47 am

42CrMo4 Plate annealed limited quantity in stock

Not many people use 42CrMo4 Plate annealed，as my experience,most of them would like to take the natural one or Q+T condition,but

Not many people use 42CrMo4 Plate annealed，as my experience,most of them would like to take the natural one or Q+T condition,but some special factory they would like to take the 42CrMo4 Plate annealed directly,as they demand the hardness:16-22 Hrc,it would be easier to machine easier.

In fact,we don’t have much 42CrMo4 Plate annealed in stock,we also keep the 42CrMo4 Plate in Q+T or natural condition most,but we have our own heat treatment factory partner,and we had cooperated for over 7 years,so we could make it as annealed condition by 1 week,I guess most of people could accept it.

We exported the 42CrMo4 Plate material to the Uddeholm which is the 500 groups company.
At last, we sold a lot of this steel grade to the South of America. Moreover, many trading companies in China also purchased this steel from us for exporting to their overseas customers.
Each year, the sales quantity for this steel material is the Top 1 in our company.

We could provide the one stop solution service. Therefore most of the customers place the 42CrMo4 Plate annealed order to us without any worry. If they need the fixed length and size, or need to cut it in flat bar, we could cut it in our factory by oursides. That is because we have our own cutting machines. Besides, we also have our own testing instruments for making sure the quality.

Chemical Composition

42CrMo4/1.7225	C	Mn	Si	P	S	Cr	Mo
42CrMo4/1.7225	0.38-0.45	0.60-0.90	0.40 max	0.035 max	0.035 max	0.90-1.20	0.15-0.30

Relevant Specifications and Equivalents

BS EN 10083	Material No.	DIN	ASTM A29	JIS G4105	BS 970-3-1991	BS 970-1955	AS 1444	AFNOR
42CrMo4	1.7225	38HM	4140	SCM440	708M40	EN19A	4140	42CD4

42CRMO4 STOCK LIST

Certificate & SGS Report

iso-9001-sgs-certify-otai

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

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Posted

January 9, 2020 at 3:07 am

H13 STEEL APPLICATION IN LIFE-Chapter2

Jiménez et al. recently investigated a plasma-assisted physical vapour deposition technique to grow (TiAl)N films on H13 tool steel [14]. This tool steel is commonly used as a forming dye material at temperatures up to 600°C. Above this temperature the surface oxidizes and spalls quickly. In order to enable this tool material to be used at higher temperatures, a protective surface coating is needed. Thermal treatment of the H13 tool steel with and without (TiAl)N coatings were investigated with an AFM used in non-contact mode. Uncoated substrates showed appreciable increase in surface roughness due to oxidation at temperatures above 600°C whereas coated samples retained similar surface profiles after temperature treatments up to 1000°C (see Figure 3.4). X-ray diffraction (XRD) measurements were used to confirm and correlate these topographical measurements with the surface reactions. Extensions of the AFM, force modulation microscopy (FMM) and phase detection microscopy (PDM) were also used to image the surface. In FMM mode the tip is scanned in contact with the sample while a displacement sinusoid of a few kilohertz is applied to the tip or sample. The applied amplitude signal is modulated according to the elastic properties of the sample. FMM can therefore be used to image hard and soft regions at the same time as topological information is recorded. PDM is used when the AFM is operated in intermittent contact mode. PDM refers to the monitoring of the phase lag between an applied signal driving cantilever oscillation and the cantilever oscillation output signal. Changes in the phase lag reflect changes in the mechanical properties of the sample surface.

Tanaka et al. investigated the effect of toner particle morphology on toner fluidity and adhesion strength using an AFM [15].

Particle fluidity and interactions are influenced by surface structure size and morphology as well as the particle size and morphology. A fractal dimension was used to quantify the particle surface shape, which was related to its flow properties, and particle adhesion forces, which were measured with an AFM. The fractal dimensions were directly scaled from the nanostructure on the toner particle surfaces. A toner particle of approximately 5.5 μm diameter was attached to the AFM tip (see Figure 3.5), which was then held close to compacted toner powder (with a pressure of 54.9 MPa).

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H13 STEEL APPLICATION IN LIFE-Chapter 1

Posted

January 9, 2020 at 3:02 am

H13 STEEL APPLICATION IN LIFE-Chapter 1

1.2344 steel has good mechanical properties and is used widely in industry, such as forming extrusion dies, forging die with large impact load, precision forging die and etc. It can satisfy the needs of the quality requirements of the mold. By the way, the surface of the mold passes through nitriding or cyanidation, the service life of the mold would increase.

H13 Steel Heat Treatment

Annealing

Heat slowly to 1550°-1650°F, hold until entire mass is heated through, and cool slowly in the furnace (40F per hour) to about 1000°F, after which cooling rate may be increased. Suitable precautions must be taken to prevent excessive carburization or decarburization.

Stress Relieving

When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, and then cool in still air (Strain Relieving).

Preheat Prior to Hardening

Warm slightly before charging into the preheat furnace, which should be operating at 1400°-1500°F.

Hardening

H13 tool steel is a steel having very high hardenability and should be hardened by cooling in still air. The use of a salt bath or controlled atmosphere furnace is desirable to minimize decarburization, and if not available, pack hardening in spent pitch coke is suggested. The temperature employed is usually 1800°-1850°F, depending on size section.

Quenching

Quench in still air or dry air blast. If complicated forms are to be hardened, an interrupted oil quench can be used. Quench part in oil and remove from the bath when it just loses its color (1000°-1100°F). Finish cooling to below 150°-125°F in air, then tempers immediately.

Tempering

Tempering is carried out in 1.2344 tool steels from 538 to 649°C (1000 to 1200°F) to obtain Rockwell C hardness of 53 to 38. Double tempering can also be performed in these steels for every one hour at the preferred tempering temperature.

H13 Steel Supply

Round Bar

Specification: Dia Max 800mm; Length: 3000-5800mm
Surface: original black, peeled, polished, machined

Sheet/Plate/Slab

Specification: thickness: 16-800mm; width: 205-810mm; length: 3000-5800mm
Surface: original black, machined, polished

Notice

We have our own cutting and processing equipment. Specifications can be cut and customized according to your requirements.

We are a professional special steel stockist and supplier with a high-quality stand for many years. As a professional H13 steel supplier, please contacts us for any request. Songshun Steel always with you.

Otai Special steel welcome you soon.

jack@otaisteel.com

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839