Alloy Steel Pipe & Tube 合金鋼管

Alloy steel pipe is a kind of seamless steel pipe, which is made by hot rolling (extrusion, expansion) or cold rolling (drawing). Its performance is much higher than the general seamless steel pipe, because this steel pipe inside containing Cr. Alloy steel pipe is mainly used in high-pressure and high-temperature pipelines and equipment such as power plants, nuclear power, high-pressure boilers, high-temperature superheaters and reheaters. The advantages of alloy steel pipes can be 100% recycled, which is environmental protection and energy saving。

Chome moly pipe is popular in ASTM A335 standard material P5, P9, P11, P12, P22, P91 and P92.
ASTM A335 Alloy pipe & tube Chemical Composition:

Grade	UNS	C≤	Mn	P≤	S≤	Si≤	Cr	Mo
P5	K41545	0.15	0.30-0.60	0.025	0.025	0.5	4.00-6.00	0.44-0.65
P9	S50400	0.15	0.30-0.60	0.025	0.025	0.50-1.00	8-10.00	0.44-0.65
P11	K11597	0.05-0.15	0.30-0.61	0.025	0.025	0.50-1.00	1.00-1.50	0.44-0.65
P12	K11562	0.05-0.15	0.30-0.60	0.025	0.025	0.5	0.80-1.25	0.44-0.65
P22	K21590	0.05-0.15	0.30-0.60	0.025	0.025	0.5	1.90-2.60	0.87-1.13
P91	K91560	0.08-0.12	0.30-0.60	0.02	0.01	0.20-0.50	8.00-9.50	0.85-1.05
P92	K92460	0.07-0.13	0.30-0.60	0.02	0.01	0.5	8.50-9.50	0.30-0.60

ASTM A335 Alloy Pipe & Tube Mechanical Properties:

Mechanical properties	Tensile, min, ksi[MPa]	Yield,min, ksi[MPa]	Elongation, %(min)	Hardness, HB（max）
P5	60[415]	30[205]	30	-
P9	60[415]	30[205]	30	-
P11	60[415]	30[205]	30	-
P12	60[415]	32[220]	30	-
P22	60[415]	30[205]	30	-
P91	85[585]	60[415]	20	250
P92	90[620]	64[440]	20	250

A335 P5 Pipe	A335 P9 Pipe	A335 P11 Pipe
A335 P12 Pipe	A335 P22 Pipe	A335 P91 Pipe

Test:Tension Test, Flattening Test, Hardness Test, or Bend Test; Hydrostatic Test or nondestructive electric test.

Applications: P11 pipe, P12 Pipe, P22 pipe, and P91 pipe, P92 Pipe are used in the power industry and petro-chemical plants, P5 pipe and P9 pipe are commonly used in refineries.