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1. The technology conditions apply to thickness no more than 150 mm 13 MnNiMo54 (DIWA353) steel production and inspection.
2. The supply condition: steel plateaccordingto normalizing + tempering state delivery
normalized: 890 ~ 950 ℃, heat preservation30 minafter socking, cooling in the still air;
Tempering: 620 ~ 690 ℃, heat preservationat least 30 minafter socking, but not more than 180 min, cooling in the still air.
3. The size, shape, weight and allow deviation.
3.1 the size of the steel plate, shape, weight and allow deviation in addition to the thickness of the steel plate deviation should be allowed to meet the provisions of the table 1 shall be in accordance with the provisions of the G713.
table1
|
nominal thickness mm |
nominal thickness allowable deviationmm |
The allowable deviationof a same plate between the minimum thickness and the maximum thickness （mm） |
||||
|
nominal thickness （mm） |
||||||
|
≥600～＜2000 |
≥2000～＜2500 |
≥2500～＜3000 |
≥3000～＜3500 |
≥3500～＜4000 |
||
|
＜80 |
+2.5 －0.3 |
1.2 |
1.3 |
1.4 |
1.4 |
1.5 |
|
＞80～150 |
+2.9 －0.3 |
1.3 |
1.4 |
1.5 |
1.5 |
1.6 |
3.2 plates shall be accordingto theoretical weight delivery, the weight computation should comply with the provision of GB713-1997.
4. The chemical composition of the steel plate chemical composition analysis and finished product melting analysis results should meet the requirements of the table 2.
Wt％ table2
|
|
C |
Si |
Mn |
P |
S |
Ni |
Mo |
Cr |
Nb |
|
Melting analysis |
≤0.15 |
0.10～0.50 |
1.00～1.60 |
≤0.020 |
≤0.010 |
0.6～1.0 |
0.20～0.40 |
0.20～0.40 |
0.005～0.020 |
|
Produce analysis |
≤0.17 |
0.05～0.56 |
0.95～1.70 |
≤0.025 |
≤0.015 |
0.55～1.05 |
0.15～0.44 |
0.15～0.45 |
0.005～0.025 |
5. Mechanical properties
mechanical properties and process performance should meet the provisions of the table 3after Steelnormalized+ tempering.
Table 3 mechanical properties and process performance
|
Stencil Thickness（mm） |
Room temperature property
|
320℃ Rp0.2 MPa |
||||
|
Rel MPa |
Rm MPa |
ElongationA (%) |
Akv （J）20℃ |
cold bend inspection 180° |
||
|
≤50 |
≥400 |
570～740 |
≥18 |
≥39 |
d＝3.5a |
|
|
＞50～≤100 |
≥390 |
≥339 |
||||
|
＞100～≤125 |
≥380 |
|
||||
|
＞125～≤150 |
≥375 |
|
||||
Note: impact test according to the arithmetic mean of calculation of three samples, allow one of sample below average, but shall not be lower than the average of 85%.
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