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1. The applicable scope
The technology conditions apply only to coke tower delayed coking unit of production and inspection.
2. The size, shape, weight, allow deviation
The steel plate size and shape, weight, deviation should be allowed to meet the provisions of SA20 standard
1. 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* |
「H」* |
|
Heat analysis |
0.03－0.13 |
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 |
≤0.010 |
≤0.010 |
≤3ppm |
|
Product analysis |
0.04－0.13 |
0.44－0.86 |
0.35－0.73 |
≤0.010 |
≤0.010 |
0.94－1.56 |
0.40－0.70 |
≤0.20 |
≤0.20 |
≤0.0025 |
≤0.010 |
≤0.010 |
≤3ppm |
注：（1）heat analysis should be according to the analysis of each sample, product analysis should press rolling a steel plate each take a sample。
（2）Embrittlement of tempering sensitivity modulus X shall meet the following requirements:：
X=(10P+5Sb+4Sn+As)×10-2≤15ppm
The element of formula replaced by ppm，such as 0.01％replaced by 100ppm。
4．dilivery state：Steel plate to normalized(allows cooling) + tempering state delivery。
5．Mechanical properties shall meet the provisions of the table 2 (try to simulate billet after welding heat treatment)。
Table 2
|
Rm(MPa) |
RP0.2(MPa) |
A(%) |
Z(%) |
Bend 180°no cracking |
-30℃charpy impact test energy，J |
|
415-585 |
≥241 |
≥22 |
≥45 |
D=2a |
≥54 average value ≥47signal value |
Note: D: bendingdiameter a: sample thickness
Impact test, shall be recorded lateral expansion value and fiber fracture percentage.
5.1 steel plate by batch inspection high temperature tensile RP0.2≥165Mpa
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