
Forged Block
Chemical composition and properties of die steel
sequence number |
Material designation |
Chemical composition ( % ) |
annealing Hardness HB |
Tempering hardness HRC |
|||||||||||
C |
Si |
Mn |
Cr |
Mo |
P |
S |
Ni |
V |
With |
To the |
|||||
1 |
5CrNiMo |
0.50-0.60 |
≤ 0.40 |
0.50-0.80 |
0.50-0.80 |
0.15-0.30 |
≤ 0.025 |
≤ 0.025 |
1.40-1.80 |
/ |
≤ 0.20 |
/ |
197-241 |
53-58 |
|
2 |
H13 |
0.32-0.45 |
0.80-1.20 |
0.20-0.50 |
4.75-5.50 |
1.10-1.75 |
≤ 0.025 |
≤ 0.025 |
/ |
0.80-1.20 |
≤ 0.20 |
/ |
≤ 235 |
≥ 60 |
|
3 |
D2 |
1.40-1.60 |
0.10-0.60 |
0.20-0.60 |
11.0-13.0 |
0.70-1.20 |
≤ 0.025 |
≤ 0.025 |
/ |
0.50-1.10 |
≤ 0.20 |
/ |
≤ 255 |
≥ 59 |
|
4 |
718 |
0.32-0.40 |
0.20-0.80 |
1.00-1.50 |
1.70-2.00 |
0.25-0.40 |
≤ 0.025 |
≤ 0.025 |
0.85-1.15 |
/ |
≤ 0.20 |
/ |
Pre-hardened 30-35 HRC Hardened 35-40 HRC |
||
5 |
4Cr13 |
0.36-0.45 |
≤ 0.60 |
≤ 0.80 |
12.0-14.0 |
/ |
≤ 0.025 |
≤ 0.025 |
/ |
/ |
≤ 0.20 |
/ |
≤ 201 |
≥ 50 |
|
6 |
4Cr16Mo |
0.33-0.43 |
≤ 1.00 |
≤ 1.00 |
15.0-17.0 |
1.00-1.30 |
≤ 0.025 |
≤ 0.025 |
/ |
/ |
≤ 0.20 |
/ |
≤ 250 |
≥ 49 |
|
7 |
NAK 80 |
0.05-0.18 |
0.15-1.00 |
1.0-2.0 |
0.20-0.40 |
0.20-0.40 |
≤ 0.025 |
≤ 0.025 |
2.30-3.50 |
/ |
0.70-1.50 |
0.50-1.50 |
37-43HRC |
Hard aging Without quenching |
|
8 |
XFP 80 |
0.12 |
- |
1.80 |
- |
0.30 |
≤ 0.025 |
≤ 0.025 |
3.0 |
/ |
1.0 |
1.0 |
37-43HRC |
Hard aging Without quenching |
Technical requirements for die steel
1. The allowable deviation of the chemical composition of steel should meet the requirements of GB222-84. The smelting method of electric furnace + vacuum refining or vacuum refining + electroslag remelting shall be specified in the contract.
2. The die steel adopts the GB/T6402-1991 standard for ultrasonic flaw detection, and the result shall not have dense defects larger than the equivalent diameter of Ø2mm. A single scattered metallurgical defect is allowed, of which no more than 3 of the equivalent diameter of Ø2-3mm, and only one of the equivalent diameter of Ø3-4 are allowed.
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