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1. The technology conditions GB3077 -88 standard with reference to the provisions of applicable to is not more than 150 mm thick plate.
2. The size, shape, weight and allow deviation
The steel plate size and shape, weight and deviation should be allowed to meet the provisions of the GB709-88.
3. Technical requirements
3.1 the chemical composition of steel (melting analysis) should comply with the regulations of the GB3077-88 standard. See table 1.
Chart 1
|
steel grade |
C |
Si |
Mn |
Mo |
Cr |
P |
S |
|
20CrMo |
0.17~0.24 |
0.17~0.37 |
0.40~0.70 |
0.15~0.25 |
0.80~0.10 |
≤0.025 |
≤0.020 |
|
30CrMo |
0.26~0.34 |
0.17~0.37 |
0.40~0.70 |
0.15~0.25 |
0.80~0.10 |
≤0.025 |
≤0.020 |
|
35CrMo |
0.32~0.40 |
0.17~0.37 |
0.40~0.70 |
0.15~0.25 |
0.80~0.10 |
≤0.025 |
≤0.020 |
|
42CrMo |
0.38~0.45 |
0.17~0.37 |
0.50~0.80 |
0.15~0.25 |
0.90~1.20 |
≤0.025 |
≤0.020 |
|
20CrMnMo |
0.17~0.23 |
0.17~0.37 |
0.90~1.20 |
0.20~0.30 |
1.10~1.40 |
≤0.025 |
≤0.020 |
|
40CrMnMo |
0.37~0.45 |
0.17~0.37 |
0.90~1.20 |
0.20~0.30 |
0.90~1.20 |
≤0.025 |
≤0.020 |
|
20Mn2 |
0.17~0.24 |
0.17~0.37 |
1.40~1.80 |
/ |
/ |
≤0.025 |
≤0.020 |
|
40Mn2 |
0.37~0.44 |
0.17~0.37 |
1.40~1.80 |
/ |
/ |
≤0.025 |
≤0.020 |
|
45Mn2 |
0.42~0.49 |
0.17~0.37 |
1.40~1.80 |
/ |
/ |
≤0.025 |
≤0.020 |
3.2 delivery status: the annealing or high temperature firing back.
3.3 machinery and process performance
3.3.1 the annealing or high temperature tempering steel thick hardness index see table 2.
Chart 2
|
steel grade |
20CrMo |
30CrMo |
35CrMo |
42CrMo |
|
hardness（HB） |
≤197 |
≤229 |
≤229 |
≤217 |
|
steel grade |
20Mn2 |
40Mn2 |
45Mn2 |
|
|
hardness（HB） |
≤187 |
≤217 |
≤217 |
|
|
steel grade |
20CrMnMo |
40CrMnMo |
|
|
|
hardness（HB） |
≤217 |
≤217 |
|
|
3.4.2 provide sample after conditioning mechanical properties of σb, σs, the delta 5, normal temperature AKV.
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