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Mould Steel

Mould Steel

Release Time:2016-01-13 15:14:40 Reading Times:3168 [ Font Size:Large Medium Small ]
1.Chemical Component
Grade C Si Mn P S Cr Ni Mo V Cu Nb
P20 0.28~0.40 0.20~0.80 0.60~1.00 ≤0.020 ≤ 0.005 1.40~2.00 0.30~0.55 ≤ 0.25
1.2311 0.35~0.45 0.20~0.40 1.30~1.60 ≤0.020 ≤ 0.01 1.80~2.10 0.15~0.25 ≤ 0.25
1.2738 0.35~0.45 0.20 ~0.40 1.30 ~1.60 ≤0.020 ≤ 0.01 1.80~2.10 0.90~1.20 0.15~0.25 ≤ 0.25
1.2312 0.38~0.45 0.30~0.50 1.40~1.60 ≤0.020 0.05 ~ 0.1 1.80~2.00 0.15~0.25 ≤ 0.2
718 0.32~0.40 0.20~0.80 1.10~1.50 ≤0.020 ≤ 0.005 1.70~2.00 0.85~1.15 0.25~0.40 ≤ 0.25
SH2311 0.20~0.40 0.20~0.80 1.30~1.60 ≤0.015 ≤ 0.005 1.80~2.10 0.10~0.30 0.30~0.55 ≤ 0.25 0.05~0.10
SH2738 0.35~0.45 0.20~0.40 1.30~1.60 ≤0.015 ≤ 0.005 1.80~2.10 0.90~1.10 0.25~0.45 0.05~0.15 ≤ 0.25
S55Cr 0.50~0.57 0.15~0.40 0.80~1.00 ≤0.02 ≤ 0.005 0.30~0.40 ≤ 0.5 ≤ 0.25
CK45 0.42~0.50 ≤0 .40 0.50~0.80 ≤0.02 ≤ 0.015 0.30~0.40 ≤ 0.2 ≤ 0.10 ≤ 0.25


Remark: H≤2ppm N≤80ppm
2.Production Process

3、External Dimension

3.1.Corner radius R≤5mm;Straightness ≤3mm/m, Straightness for full length≤0.3%L;Rectangularity 90°±2. Length Tolerance for the fixed size product (0,+30). End cut slope≤10mm.

3.2.Delivery quantity usually based on actual weighing result

3.3.Remove defects like surface crack, fold, scab, inclusion and so on. All defect cleaning needs to be in smooth transition, breadth depth ratio ≥5. The final actual dimension should be within the customer nominal dimension requirements.

3.4.Dimension tolerance as below :

Nominal Dimension(mm) Thickness Tolerance(mm) Width Tolerance(mm)
200-600 (0,+10) (0,+15)
600-1000 (0,+15) (0,+20)
1000-1500 QT unqualified (0,+25)
1500-2000 QT unqualified To be confirmed with customer requirement

3.5.Smelting process :BOF +LF+VD

3.6.Non-metallic Inclusion
Sample from the body or on the ingot head and forging into 90-200mm square specimen according to GB/T10561, and qualified class see the below table.

A≤ B≤ C≤ D≤
thin heavy thin heavy thin heavy thin heavy
1.5 1.5 1.0 1.0 1.0 1.0 1.5 1.0

3.7.Ultrasonic Test

UT according to SEP 1921 E/e, thickness≤600mm; D/d, thickness>600mm.

3.8.Grain Size :

Austenite or actual grain size at least 5 or better

3.9.Forging Ratio

Forging ratio ≥4

3.10.Hardness Requirements

P20 series(P20, 1.2311,  SH2311, 1.2312)
Thickness(mm) Hardness(HRC) Hardness discrepancy in same section ≤(HRC)
200-300 30~36 Specific hardness according to customer’s requirements
301-450 30~36
451-520 30~36

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