• 1.25Cr/0.5Mo/Si

Certificates

WYJ019-2005                 1.25Cr-0.5Mo-Si

1. The applicable scope

This technical condition applies only to sinopec Beijing yanshan branch catalytic gasoline desulfurization with adsorption device

The hydrogen 1.25 Cr-0.5 Mo-Si steel plates.

2. The size, shape, quality and allow deviation

The size of the steel plate, appearance, quality, and deviation should be allowed to meet SA387 / SA387M ASME of the provisions of the standard.

3. Technical requirements

3.1 the chemical composition of the steel plate should be in accordance with table 1

Table 1  Wt%

 

 

C

Si

Mn

P

S

Cr

Mo

Ni

Cu

Sb

Sn

As

[H]*

Mealtime analysis

≤0.17

0.10~0.50

1.00~1.60

≤0.020

≤0.010

0.60~1.00

0.20~0.40

0.20~0.40

0.005~0.020

≤0.003

≤0.015

≤0.016

≤2ppm

Product analysis

≤0.17

0.05~0.56

0.95~1.70

≤0.025

≤0.010

0.55~1.05

0.15~0.44

0.15~0.45

0.001~0.025

≤0.003

≤0.015

≤0.016

≤2ppm

 

 

* record the results of analysis of elements, not as an acceptance conditions.

Steel product analysis (including the X factor) according to rolling out a sampling inspection.

A) embrittlement of tempering sensitivity modulus should comply with the following requirements:

X = (10 P + 5 Sb + 4 Sn + As) X 10-2 than 15 PPM

Type of element to the content of PPM generation, such as 0.01% to 100 PPM

3.2 delivery status: the steel plate to normalized(allows cooling) + tempering state delivery.

3.3 to the steel plate with try everything all inspection simulation billet after welding heat treatment process system for:

The biggest simulation after welding heat treatment: 690 + 14 ℃×20 + 20 h

Minimum simulation welding heat treatment: 690 + 14 ℃x 6 + 20 h

3.4 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)

A50

(%)

Z

(%)

cold impact test

 

 

A single high yield strength

Rp0.2 (Mpa)

+10℃charpy impact test energy

J

-20℃charpy impact test energy

J

515~690

≥310

22

45

A

B

≥54

(average)

≥48

(single value)

≥43

(average)

≥34

(single value)

注:A:thicknessT≤25mm,d=1.5T,25mm<T≤100mm,d=2.0T。

B:satisfy at the same time470℃Rp0.2>214.0 Mpaand 538℃Rp0.2>194.5 Mpa。

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