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1. The scope of the technical conditions used in petrochemical industry hydrogenation reforming reaction is 2 1/4 Cr-1 Mo steel production.
2. Of the steel plate size and shape, weight and deviation should be allowed to meet the provisions of GB6654-1996 standard.
3. Technical requirements
3.1 chemical composition
The chemical composition of the steel plate should be in accordance with table 1:
|
composition |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Cu |
|
heat analysis
|
≤0.15 |
≤0.10 |
0.30～0.60 |
≤0.010 |
≤0.010 |
2.00～2.50 |
0.90～1.10 |
≤0.20 |
≤0.20 |
|
product analysis |
≤0.15 |
≤0.15 |
0.25～0.66 |
0.012 |
0.012 |
1.95～2.62 |
0.85～1.15 |
≤0.20 |
≤0.20 |
|
composition |
Sb* |
Sn* |
As* |
(H)** |
|
heat analysis
|
≤0.003 |
≤0.015 |
≤0.016 |
≤2PPm |
|
product analysis |
≤0.003 |
≤0.015 |
≤0.016 |
≤2PPm |
Note: (1) * analysis results only for record, does not make the acceptance conditions.
(2) smelting furnace, finished product analysis according to analysis by rolling out a sampling inspection.
(3) the tempering embrittlement of full should satisfy the following requirements sensitivity:
X = (10 P + 5 Sb + 4 Sn + As) X 10-2 than 15 PPm
Type of element are in PPm content generation into, such as 0.01% to 100 PPm generation into.
J = (Si + Mn) (P + Sn) by 104 or 120
Type of element are to the percentage in the generation, such as 0.15% to 0.15 generation into.
3.2 delivery status: the steel plate to normalized (allows cooling) + tempering state delivery, normalized temperature should not be more than 968 ℃, 677 ℃temperature tempering shall not be less than.
3.3 mechanical properties:
The mechanical properties of the steel plate should comply with the provisions of the table 2 (sample for simulation of heat treatment after welding state) :
Chart 2
|
tensile strength σb MPa |
yield σ0.2 MPa |
elongation δ5 ％ |
reduction of areaψ ％ |
cold impact test b＝2a |
-30℃charpy compact ennergy J注(1) |
540℃Gawra σ0.2 MPa |
|
515~690 |
≥310 |
≥18 |
≥45 |
bend 180°No crack note(2) |
≥54(average) ≥48(singal) |
≥205 |
Note: (1) the impact test, shall be recorded lateral expansion value and fibrous fracture percentage for reference.
(2) thick plateT≤25mm, d = 2 a; 25 mm < T ≤50 mm, d = 2.5 a
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