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Die Steels
Die Steels
Die Steels
Die Steels
Die Steels
Die Steels
Die Steels
Die Steels
Die Steels
Die Steels

Die Steels

AT&M-HEYE built Tool and Die Steel Research Center, which supported by National Engineering Research Center for Advanced Iron and Steel Materials Technology. AT&M-HEYE aims to design , develop and produce high performance die steel by IF, LF, VD melting process and ESR, SF(spray forming) , PM(powder metallurgy) special process, to replace imported die steel and provide more solutions of die steel. The cold work die steel HYC3 which has developed successfully with high wear resistance,excellent comprehensive performance and cost-effective has overcome the weakness of traditional D2, M2, LD etc., being well applied in various high performance cold work die area.The new kind of high alloy die steel with fine structure and less or no segregation was developed and produced by SF, PM special producing process in replace of traditional process.


AT&M-HEYE have advanced process, such as LF treatment, VD treatment, ESR treatment, homogenization treatment, multi-directional forging, controlled forging, controlled rolling and controlled colling which can guarantee our products with high performance such as low gas content, low non-metallic, high purity, no chemical segregation, excellent toughness and ductility in all directions.

Typical Applications

Typical applications are as below:


           die-casting mould                           threading plate                                 roll                                  hot-forging die


Technical Specifications

Heat Treatment and Quenching Hardness Table
Annealing hardness Quenching temperature Quenching medium Hardness
HB,≤ HRC,≥
HYD2 255 1000~1010 oil 59
HYD2Co 255 1000~1010 oil 59
HYC1 248 1020~1040 oil 62
HYC2 248 1100~1150 oil 60
HYC3 248 1110~1130 oil 63
HYC118 235 1010~1030 oil or air 64
HIT H13 225 1010~1030 oil or air 53
HY H418 225 1010~1030 oil or air 55
HIT H418
HY H419 235 1010~1030 oil or air 61
HIT H419
HYU2 235 1080~1100 oil or air 60
HYH21 255 1140~1160 oil 52
HYRC1 235 1030 oil  
HYRH12 235 1030~1050 oil 63
HYH13E 235 1050~1060 oil or air 62
HY H418E 235 1020~1030 oil 62



Macrostructure and defect rating table
D/mm Loose Center General Loose Segregation
≤150 1 1 1
>150~200 1.5 1.5 1.5
>200~350 2 2 2



 The depth of total decarburization layer (ferrite + transition layer) on the surface of hot-rolled round steel and forged round steel shall not be greater than 0.35 + 1.1% d (D is the nominal diameter of round steel), and decarburization layer is not allowed for silver bright steel. (according to the corresponding standards



Eutectic carbide Inhomogeneity Rating Table
Detection standard atlas GB/T14979 GB/T14979
4 2、3
40~60 3 3
≥60~80 4 4
≥80~100 4 5
≥100~120 4 6
≥120~160 5 7
≥160~200 5 6A、5B
≥200~300 6 7A、6B


Nonmetallic Inclusions:

 Non metallic inclusions shall be evaluated according to GB / t10561. Class A, B, C and D inclusions shall be ≤ 1.0 level and DS type inclusions shall be ≤ 1.5 grade – a method

Annealed Structure:

 After sufficient spheroidizing annealing, the annealed structure shall be uniform spherical pearlite, with carbides distributed on the matrix. The spheroidization degree of HYC1, HYC2 and HYC3 shall refer to the first rating chart of GB / T 1299, and the qualified grade is grade 2-4.

Flaw Detection:

 Ultrasonic flaw detection is carried out for the steel according to GB / T 4162, reaching the qualified level.

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