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D2 mold steel high wear-resistant, micro-deformation cold work die steel, wind-hard tool steel, carbon content up to 1.5%, chromium content is higher than 11.5%, heat treatment hardness up to 60HRC. D2 steel can be used to produce cold work die steel with large cross section, complex shape, high impact force and high wear resistance, such as silicon steel sheet die, cold cut scissors, trimming die and so on. So do you know his strengths and application examples?

D2 mold steel advantage:
1. Good processability and stable heat treatment size
2, excellent machining type
3, when the hardness is hard, excellent dimensional stability
4, after hard and tempering, a good match between high surface
hardness and body toughness

D2 mold steel Application examples:
It is used for drawing the deep drawing die of the refrigerator compressor, and the quenching hardness is 56~58HRC.
In order to improve the service life of the flat steel rolled material of D2 cold work die, the wear resistance and impact toughness of the steel are greatly improved by the method of adding rare earth, thereby achieving the purpose of improving the service life of the flat die flat steel.
Since the content of V and Mo in D2 steel is higher than that of Cr12MoV steel, it has better comprehensive performance, and the traditional Cr12MoV steel will be gradually replaced.
The rolling wheel made of D2 steel and the cold stamping die of the Taiwan adjusting plate can increase the service life by 5-6 times compared with the Cr12MoV steel.

DC53 heat treatment hardness is higher than SKD11, high temperature (520-530 °C) can reach 62-63HRC high hardness after tempering, DC53 exceeds SKD11 in strength and wear resistance.
The toughness is twice that of SKD11. The toughness of DC53 mold steel is prominent in cold-working die steel. The tools made with DC53 rarely crack and crack, which greatly improves the service life.
The residual stress after the wire cutting process is small, the residual stress is reduced by the high-temperature tempering, and the crack and deformation after the wire cutting process are suppressed.
Machinability and abrasiveness exceed those of SKD11. DC53 mold steel is superior to SKD11 in terms of machinability and abrasiveness. The use of DC53 mold steel increases tool life and reduces machining processes.

use:
1. Punching mold, cold forming mold, cold drawing mold
2. Forming rolls, punches

Precision stamping die
Precision blanking die for wire cutting and stamping die for various purposes
Tool for plastic deformation of difficult-to-machine materials
Cold forging, deep drawing, and boring die
other
High-speed punching punch, stainless steel plate punch

Practical features:
DC53 cold work die steel
(1) Machinability and good abrasiveness.
The machinability and the abrasiveness are superior to those of the SKD11, so the processing tool has a long life and the number of processing hours is relatively low.
(2) Advantages of heat treatment
Quench hardening is higher than SKD11, so it can improve the defects of insufficient hardness during vacuum heat treatment.
(3) Advantages of online cutting processing
High-temperature tempering can reduce the residual stress and eliminate the residual Worthfield iron, which can prevent the cracking and deformation of the wire cutting process.
(4) Advantages in surface hardening treatment
The surface hardness after surface hardening is higher than that of SKD11, so the mold performance can be improved.
(5) Advantages in repairing welding operations
Since the preheating and post-heating temperatures are lower than SKD11, the repair welding operation is relatively simple.

When purchasing mold steel, it is necessary to first consider whether some basic properties of the mold steel can be adapted to the needs of the manufactured mold. In general, the hardness, strength, toughness, wear resistance and polishing of steel are very important. These properties can comprehensively reflect the comprehensive performance of the die steel, and determine the application range to a certain extent. According to statistics, the early failure of molds is about 10% due to improper selection of mold steel and internal defects, and about 50% caused by improper heat treatment. Therefore, it is of great significance to correctly select mold steel with good quality.

1. Hardness requirements of mold steel

The working state of the mold is complicated during work. For example, the hot working mold usually undergoes alternating stress under the exchange temperature field, so it should have good resistance to softening or plastic deformation, and can still be used in long-term working conditions. Maintain the shape and dimensional accuracy of the mold. For the cold work die, the hardness is generally selected above 56HRC-62HRC, while the hot work die is especially a mold that requires high thermal fatigue resistance, and the hardness is usually around 45HRC-52HRC. For plastic molds, the general hardness requirement is around 28HRC-36HRC.

2. Mold steel strength and toughness requirements

During the forming process, the parts are subjected to huge loads such as impact and distortion, especially modern high-speed stamping, high-speed precision forging and liquid forming technologies, as well as the development of one-shot forming technology. If the strength and toughness of the die steel are not enough, it may cause the edge or partial collapse, chipping or fracture of the cavity to fail early, so the mold should have high hardness and toughness after heat treatment.

3. Mold steel wear resistance requirements

When the mold part is formed, the mold steel and the mold cavity surface move relative to each other, causing the surface of the cavity to wear, so that the dimensional accuracy, shape and surface roughness of the mold is changed and fail. Wear is a complicated process, and many influencing factors depend largely on the chemical composition inhomogeneity, microstructure, and mechanical properties of the die steel.

4. Fatigue performance requirements of mold steel

When the mold is working, it is subjected to the alternating stress of mechanical shock and thermal shock. During the working process of the hot working mold, the thermal alternating stress causes the mold to crack more obviously. Cracks caused by stress and temperature gradients often result in the rapid propagation and expansion of shallow and fine cracks on the surface of the cavity leading to mold failure. In addition, the chemical composition of steel and the unevenness of the structure, metallurgical defects such as non- metallic inclusions, pores, microcracks, etc. in the steel can cause the fatigue strength of the steel to decrease, because under the action of alternating stress, first These weak areas produce fatigue cracks and develop into fatigue damage.

5. Polishing requirements for mold steel

Steel with excellent polishing performance can throw a mirror effect without creases or lines. In general, steels with good polishing properties have high hardness.

P20 and SKD11 mold steel

First, sufficient strength, wear resistance, sufficient hardened layer and strength, toughness, surface hardness and the like.
Although it is not required to be as high as a cold work die, it should meet the requirements for use.
Second, the cold and hot processing performance is good, the surface roughness value is low, the good mirror polishing performance, the surface pattern etching performance and the corrosion resistance, the heat treatment deformation, the metallographic structure, and the mold size are stable.
It has high-temperature strength, toughness, hardness and wear resistance, and has high tempering stability and excellent heat fatigue resistance. High hardenability to ensure that the mechanical properties of the entire section are basically the same.

P20 and SKD11 mold steel

The reason for the high hardening is that it contains about 1.1% of C carbon, so it can be hardened to HRC63 in heat treatment, and it is greatly improved by adding many other elements such as chromium, molybdenum, vanadium, cobalt, etc. P20, SKD11 Hardenability of die steel.
Excellent thermal conductivity, so that heat can be transmitted out as quickly as possible to avoid excessive cavity temperature. Good oxidation resistance.

Today, there is an inquiry about 4140 steel from Turkey. During the communication with the customer, I talked about some characteristics of 4140. I was often asked if the 4140 steel is a material. Now I explain to you today, 4140 steel is native to the American standard STM 4140 alloy structural steel, and belongs to ultra-high strength steel, has high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and resistance to multiple impacts after quenching and tempering, low-temperature Good impact toughness; 4140 steel is mainly used for large machinery gears and large and medium plastic molds. Delivery generally has two states: one is hot rolled black skin delivery, and the other is pre-hard delivery.

Therefore, Otai special steel can provide mold steel, alloy steel, and special steel with quality assurance, to ensure that you are satisfied. We also have export standard testing, reasonable price to let you save 30%, each piece of steel has been strictly tested, welcome inquiry.

One team of analysts contends that higher steel prices could help U.S. Steel bounce back.

Shares of U.S. Steel (X) have lost a quarter of their value this year, but with steel prices heading higher one team of analysts call it “well-positioned for the short-term ‘catch up trade.'”

That would be BMO analysts David Gagliano and Matt Cartoceti, who see steel makers pushing prices higher to account for higher input costs, something that would help so-called mini-mills like Steel Dynamics (STLD) and Nucor (NUE), but U.S. Steel as well. They explain:

We expect the positive pricing momentum in the U.S. to continue into September, primarily due to higher input costs (scrap, iron ore, met coal, and meaningfully higher graphite electrode costs), which collectively open the door for producers (particularly the mini-mills) to attempt to push through additional price increases. For 4Q, early signals suggest a plateau in prices (stagnant lead times and end-market demand, and increasing inventories). However, in our view, downward pricing risk is limited unless the recent trend of declining imports reverses in 4Q17. Regarding the stocks, in our view, the steel equities remain inexpensive on lower than spot price assumptions, trading at 6.2x/5.3x 2017E/2018E EBITDA, based on representative HRC prices of $610/t in 2H17, and $600/t in 2018. Long-term preference remains STLD, while X is well positioned for the short-term ‘catch up trade‘ in our view.

London copper, lead and zinc on April 18 hit a three-month low, nickel fell to the lowest in June.

London copper, lead and zinc on April 18 hit a three-month low, nickel fell to the lowest in June, due to tensions in Northeast Asia to the UK will be held ahead of the general election caused by geopolitical concerns, affecting investors Basic metals and other interest in the economy.

“There are still some uncertainties in the market for geopolitical issues, and there are some risk aversion,” said Elper analyst Casper Burgering. “It is expected that this year’s copper market will be in short supply and demand is very good … but these factors fail to benefit copper ”

Base metal prices fell, aluminum also picked up earlier gains. The traders returned to the market after a four-day holiday on Easter, responding to a news that China would cut production capacity, so that aluminum once rose, and the Shanghai Futures Exchange aluminum price hit a four-year high on Monday.

London Metal Exchange (LME) index three-month copper fell 2.1 percent to $ 5573, intraday fell to the lowest level in early January to $ 5569.

Basic metals fell across the board, the fundamentals are difficult to embarrass the geopolitical situation
LME aluminum closed 0.9 percent lower at $ 1,892, rising to a one-week high of $ 1958.50.

Three-month lead fell the most, fell 6%, to close at $ 2105, intraday low see the lowest three months 2098 US dollars.

Basic metals fell across the board, the fundamentals are difficult to embarrass the geopolitical situation
Zinc futures fell 3.8 percent to $ 2525, reaching the lowest of $ 2517 in December.

Nickel futures fell 4.5 percent, to $ 9310, hit the lowest in June to $ 9305.

Tin futures fell 0.7 percent to $ 19475.