WYJ009-2002                      2 1/4Cr-1Mo

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:

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

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