Certificates

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:

 

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