Pipes And Tubes

Alloy Steel ERW Pipes Chemical Properties

Alloy Steel
	C	Cr	Mn	Mo	P	S	Si
	0.05 – 0.15	1.00 – 1.50	0.30 – 0.60	0.44 – 0.65	0.025 max	0.025 max	0.50 – 1.00

 

Mechanical Characteristics Alloy Steel Chrome moly Pipes

Tensile Strength, MPa	Yield Strength, MPa	Elongation, %
415 min	205 min	30 min

Outside Diameter & Tolerance of ASME SA335 Alloy Pipe

ASTM A450	Hot rolled	Outside Diameter, mm	Tolerance, mm
		OD≤101.6	+0.4/-0.8
		101.6＜OD≤190.5	+0.4/-1.2
		190.5＜OD≤228.6	+0.4/-1.6
	Cold Drawn	Outside Diameter, mm	Tolerance, mm
		OD＜25.4	±0.10
		25.4≤OD≤38.1	±0.15
		38.1＜OD＜50.8	±0.20
		50.8≤OD＜63.5	±0.25
		63.5≤OD＜76.2	±0.30
		76.2≤OD≤101.6	±0.38
		101.6＜OD≤190.5	+0.38/-0.64
		190.5＜OD≤228.6	+0.38/-1.14
ASTM A530 & ASTM A335	NPS	Outside Diameter, inch	Tolerance, mm
		1/8≤OD≤1-1/2	±0.40
		1-1/2＜OD≤4	±0.79
		4＜OD≤8	+1.59/-0.79
		8＜OD≤12	+2.38/-0.79
		OD>12	±1%

ASME SA335 Alloy Steel Custom Pipes Wall thickness

STM A450	Hot rolled	Outside Diameter, mm	Tolerance, %
		OD≤101.6, WT≤2.4	+40/-0
		OD≤101.6, 2.4＜WT≤3.8	+35/-0
		OD≤101.6, 3.8＜WT≤4.6	+33/-0
		OD≤101.6, WT>4.6	+28/-0
		OD>101.6, 2.4＜WT≤3.8	+35/-0
		OD>101.6, 3.8＜WT≤4.6	+33/-0
		OD>101.6, WT>4.6	+28/-0
	Cold Drawn	Outside Diameter, mm	Tolerance, %
		OD≤38.1	+20/-0
		OD>38.1	+22/-0
ASTM A530	NPS	Outside Diameter, inch	Tolerance, %
		1/8≤OD≤2-1/2	+20.0/-12.5
		3≤OD≤18, WT/OD≤5%	+22.5/-12.5
		3≤OD≤18, WT/OD>5%	+15.0/-12.5
		OD≥20, WT/OD≤5%	+22.5/-12.5
		OD≥20, WT/OD>5%	+15.0/-12.5

Alloy Steel Grade Pipes Heat Treatment

	P5, P9, P11, and P22
Grade	Heat Treatment Type	Normalizing Temperature Range F [C]	Subcritical Annealing  or Tempering  Temperature Range F  [C]
P5 (b,c)	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
	Subcritical Anneal (P5c only)	*****	1325 - 1375 [715 - 745]
P9	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
P11	Full or Isothermal Anneal
	Normalize and Temper	*****	1200 [650]
P22	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
P91	Normalize and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]
	Quench and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]