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1. Applicable scope
The technology conditions can only be used for ≤60 mm thickness of coke tower in 14 Cr1MoR steel plate with hydrogen production and inspection.
2. The steel plate size and shape, weight, allow deviation
The steel plate size and shape, weight, deviation should be allowed to meet the provisions of GB6654-1994 standard.
3. The chemical composition of the steel plate should be in accordance with table 1.
Table 1
|
composition |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Cu |
Sb* |
Sn* |
As* |
|
Heat analysis |
－0.05－0.17 |
0.50－0.80 |
0.40－0.65 |
≤0.010 |
≤0.010 |
1.00－1.50 |
0.45－0.65 |
≤0.20 |
≤0.20 |
≤0.0025 |
≤0.015 |
≤0.016 |
|
product analysis
|
0.04－0.17 |
0.44－0.86 |
0.35－0.73 |
≤0.012 |
≤0.012 |
0.94－1.56 |
0.40－0.70 |
≤0.25 |
≤0.20 |
≤0.0025 |
≤0.015 |
≤0.016 |
Note: (1) smelting furnace analysis according to the sample and the finished product should be according to the analysis by rolling test.
(2) * mean provide value, not make judgement basis.
4. Delivery status: the steel plate to normalized (allows cooling) + tempering state delivery.
5. Mechanical properties should be consistent with the provisions of the table 2. (sample for simulation of heat treatment after welding state)
Table 2
|
Rm(MPa) |
RP0.2(MPa) |
A(%) |
Z(%) |
475℃GawraRP0.2(MPa) |
cold bend inspection B=2a |
0℃charpy impact energy，J |
|
|
RP0.2 |
Rm |
||||||
|
515-690 |
≥310 |
≥18 |
≥45 |
≥185.5 |
≥345 |
D=2a |
≥80 average value ≥60signal value |
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