ASTM A335 P91, Seamless Ferritic Alloy Steel Pipe, High Pressure Steel Pipe, Boiler Steel Pipe, ASME SA335, P91, ASTM A335

ASTM A335/ASME SA335 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

Standard: ASTM A335, ASME SA335
Equivalent Standards: EN 10216-2, ASTM A213, ASME SA213, GOST 550-75, NBR 5603

Material: P91, K91560
Equivalent Material: T91, K90901, X10CrMoVNb9-1, 1.4903

Chemistry Composition

C, %	Mn, %	P, %	S, %	Si, %	Cr, %	Mo, %	V, %	N, %	Ni, %	Al, %	Nb, %
0.08-0.12	0.3-0.6	0.02 max	0.01 max	0.2-0.5	8.0-9.5	0.85-1.05	0.18-0.25	0.03-0.07	0.4 max	0.04 max	0.06-0.10

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Hardness, HB
585 min	415 min	20 min	250 max

Outside Diameter & Tolerance

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%

Wall thickness & Tolerance

ASTM 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

ASTM A335/A335M specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high temperature service. Pipe ordered to ASTM A335/A335M specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding.

Manufacture: pipes shall be made by the seamless process and shall be either hot finished or cold drawn with the finishing treatment.
Heat Treatment: full or isothermal anneal, normalize and temper.
Inspection & Test: chemistry composition analysis, tensile test, hardness test, flattening test, flaring test, NDT, surface inspection and dimension check.

Length: 5800mm; 6000mm; 6096mm; 11800mm; 12000mm; and so on.
Max length: 16000mm; Max outside diameter: 1750mm; Max wall thickness: 150mm; finning and studded process can be provided.
Option: shot blasting on the outside surface to remove mill scale, make the surface matte colour; surface polishing as preparation work done for further processing, for instance finning.

Download ASTM A335 P91 Product Manual

Keyword: Seamless Ferritic Alloy Steel Pipe, High Pressure Steel Pipe, Boiler Steel Pipe, ASME SA335, P91, ASTM A335

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