ASTM A335 Alloy Steel Seamless Pipe Specification

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ASTM A335

Standard Overview:

ASTM A335 is a standard specification governing seamless ferritic alloy steel pipes used in high temperature service. This specification ensures that the materials used can withstand extreme conditions such as high pressure and temperature.

Main Materials:

Ferritic alloy steels such as P5, P9, P11, P22, and P91.

Scope of Application:

ASTM A335 pipes are mainly used in power generation, petrochemical, and oil and gas industries for boilers, heat exchangers, superheaters, and other equipment exposed to high temperatures and pressures. It is an ideal choice for critical applications in industrial plants and refineries.

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Specification of ASTM A335

Standard	ASTM A335
Manufacturing Processes	SMLS (Cold Drawn Seamless)
Manufacturing Processes	SMLS (Hot Finished Seamless)
Outside Diameter	21.3mm – 610mm (1/2″ – 24″)
Wall Thickness	3.2mm – 76mm
Pipe Length	6 meters, 12 meters or customized
Steel Grade	ASTM A335 P1, ASTM A335 P5c, ASTM A335 P15, ASTM A335 P91, ASTM A335 P2, ASTM A335 P9, ASTM A335 P21, ASTM A335 P92, ASTM A335 P5, ASTM A335 P11, ASTM A335 P22, ASTM A335 P122, ASTM A335 P5b, ASTM A335 P12, ASTM A335 P23, ASTM A335 P911
Corrosion Prevention	Lacquer, Varnish, Oiling, Galvanizing
End Processes	Square Cut, Bevelling, Threading, Grooving
Further Processing	Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

Dimension

Steel Pipe Dimensions Chart ANSI B36. 10 & 36.19
Nominal Pipe Size		Outside Diameter (mm)	Nominal Wall Thickness Schedule
NPS	DN	OD	SCH 20	SCH 30	SCH STD	SCH 40	SCH 60	SCH XS	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160	SCH XXS
1/8	6	10.3	–	1.45	1.73	1.73	–	2.41	2.41	–	–	–	–	–
1/4	8	13.7	–	1.85	2.24	2.24	–	3.02	3.02	–	–	–	–	–
3/8	10	17.1	–	1.85	2.31	2.31	–	3.20	3.20	–	–	–	–	–
1/2	15	21.3	–	2.41	2.77	2.77	–	3.73	3.73	–	–	–	4.78	7.47
3/4	20	26.7	–	2.41	2.87	2.87	–	3.91	3.91	–	–	–	5.56	7.82
1	25	33.4	–	2.9	3.38	3.38	–	4.55	4.55	–	–	–	6.35	9.09
1 1/4	32	42.2	–	2.97	3.56	3.56	–	4.85	4.85	–	–	–	6.35	9.70
1 1/2	40	48.3	–	3.18	3.68	3.68	–	5.08	5.08	–	–	–	7.14	10.15
2	50	60.3	–	3.18	3.91	3.91	–	5.54	5.54	–	–	–	8.74	11.07
2 1/2	65	73	–	4.78	5.16	5.16	–	7.01	7.01	–	–	–	9.53	14.02
3	80	88.9	–	4.78	5.49	5.49	–	7.62	7.62	–	–	–	11.13	15.24
3 1/2	90	101.6	–	4.78	5.74	5.74	–	8.08	8.08	–	–	–	–	–
4	100	114.3	–	4.78	6.02	6.02	–	8.56	8.56	–	11.13	–	13.49	17.12
5	125	141.3	–	–	6.55	6.55	–	9.53	9.53	–	12.70	–	15.88	19.05
6	150	168.3	–	–	7.11	7.11	–	10.97	10.97	–	14.27	–	18.26	21.95
8	200	219.1	6.35	7.04	8.18	8.18	10.31	12.70	12.70	15.09	18.26	20.62	23.01	22.23
10	250	273.0	6.35	7.80	9.27	9.27	12.70	12.70	15.09	18.26	21.44	25.40	28.58	25.40
12	300	323.8	6.35	8.38	9.53	10.31	14.27	12.70	17.48	21.44	25.40	28.58	33.32	25.40
14	350	355.6	7.92	9.53	9.53	11.13	15.09	12.70	19.05	23.83	27.79	31.75	35.71	–
16	400	406.4	7.92	9.53	9.53	12.70	16.66	12.70	21.44	26.19	30.96	36.53	40.49	–
18	450	457	7.92	11.13	9.53	14.27	19.05	12.70	23.83	29.36	34.93	39.67	45.24	–
20	500	508	9.53	12.70	9.53	15.09	20.62	12.70	26.19	32.54	38.10	44.45	50.01	–
22	550	559	9.53	12.70	9.53	–	22.23	12.70	28.58	34.93	41.28	47.63	53.98	–
24	600	610	9.53	14.27	9.53	17.48	24.61	12.70	30.96	38.89	46.02	52.37	59.54	–
26	650	660	12.70	–	9.53	–	–	12.70	–	–	–	–	–	–
28	700	711	12.70	15.88	9.53	–	–	12.70	–	–	–	–	–	–
30	750	762	12.70	15.88	9.53	–	–	12.70	–	–	–	–	–	–
32	800	813	12.70	15.88	9.53	17.48	–	12.70	–	–	–	–	–	–
34	850	864	12.70	15.88	9.53	17.48	–	12.70	–	–	–	–	–	–
36	900	914	12.70	15.88	9.53	19.05	–	12.70	–	–	–	–	–	–
38	950	965	–	–	9.53	–	–	12.70	–	–	–	–	–	–
40	1000	1016	–	–	9.53	–	–	12.70	–	–	–	–	–	–
42	1050	1067	–	–	9.53	–	–	12.70	–	–	–	–	–	–
44	1100	1118	–	–	9.53	–	–	12.70	–	–	–	–	–	–
46	1150	1168	–	–	9.53	–	–	12.70	–	–	–	–	–	–
48	1200	1219	–	–	9.53	–	–	12.70	–	–	–	–	–	–

Chemical Requirement

Chemical Requirements
Grade	UNS DesignationA	Composition, %
Grade	UNS DesignationA	Carbon	Manganese	Phosphorus max	Sulfur max	Silicon	Chromium	Molybdenum	Others
P1	K11522	0.10–0.20	0.30–0.80	0.025	0.025	0.10–0.50	. . .	0.44–0.65	…
P2	K11547	0.10–0.20	0.30–0.61	0.025	0.025	0.10–0.30	0.50–0.81	0.44–0.65	…
P5	K41545	0.15 max	0.30–0.60	0.025	0.025	0.50 max	4.00–6.00	0.45–0.65	…
P5b	K51545	0.15 max	0.30–0.60	0.025	0.025	1.00–2.00	4.00–6.00	0.45–0.65	…
P5c	K41245	0.12 max	0.30–0.60	0.025	0.025	0.50 max	4.00–6.00	0.45–0.65	…B
P9	S50400	0.15 max	0.30–0.60	0.025	0.025	0.25– 1.00	8.00– 10.00	0.90– 1.10	…
P11	K11597	0.05–0.15	0.30–0.60	0.025	0.025	0.50– 1.00	1.00– 1.50	0.44–0.65	…
P12	K11562	0.05–0.15	0.30–0.61	0.025	0.025	0.50 max	0.80– 1.25	0.44–0.65	…
P15	K11578	0.05–0.15	0.30–0.60	0.025	0.025	1.15– 1.65	. . .	0.44–0.65	…
P21	K31545	0.05–0.15	0.30–0.60	0.025	0.025	0.50 max	2.65–3.35	0.80– 1.06	…
P22	K21590	0.05–0.15	0.30–0.60	0.025	0.025	0.50 max	1.90–2.60	0.87– 1.13	…
P23	K41650	0.04–0. 10	0.10–0.60	0.030 max	0.010 max	0.50 max	1.90–2.60	0.05–0.30	V 0.20–0.30 Cb 0.02–0.08 B 0.0005–0.006 N 0.030 max AI 0.030 max W 1.45-1.75
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	V 0. 18–0.25 N 0.03–0.07 Ni 0.40 max Al 0.04 max Cb 0.06–0.10
P92	K92460	0.07–0.13	0.30–0.60	0.02	0.01	0.50 max	8.50-9.50	0.30-0.60	V 0. 15–0.25 N 0.03–0.07 Ni 0.40 max Al 0.04 max Cb 0.04–0.09 W 1.5–2.00 B 0.001–0.006
P122	K92930	0.07–0.14	0.70 max	0.02	0.01	0.50 max	10.00-12.50	0.25-0.60	V 0.15–0.30 W 1.50–2.50 Cu 0.30– 1.70 Cb 0.04–0.10 B 0.0005–0.005 N 0.040–0. 100 Ni 0.50 max Al 0.040 max
P911	K91061	0.09–0.13	0.30–0.60	0.020 max	0.01 max	0.10-0.50	8.50-10.50	0.90-1.10	V 0.18–0.25 Ni 0.40 max Cb 0.060–0.10 B 0.0003–0.006 N 0.04–0.09 Al 0.04 max W 0.90– 1.10
A New designation established in accordance with Practice E 527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS). B Grade P 5c shall have a titanium content of not less than 4 times the carbon content and not more than 0.70 %; or a columbium content of 8 to 10 times the carbon content.

Mechanical Requirement

The mechanical requirements for our ASTM A335/A335M standard steel pipe include transverse or longitudinal tensile tests, flattening tests, and hardness or bend tests.

These tests ensure that our pipes can withstand the mechanical stresses encountered during service. They also ensure that our pipes have the necessary hardness and flexibility to withstand bending, flanging, and similar forming operations.

Mechanical Properties	Grade
Mechanical Properties	P1, P2	P12	P23	P91	P92, P911	P122	All Others
Tensile Strength, min:
ksi	55	60	74	85	90	90	60
MPa	380	415	510	585	620	620	415
Yield Strength, min:
ksi	30	32	58	60	64	58	30
MPa	205	220	400	415	440	400	205

Steel Grades

We offer our ASTM A335/A335M standardized Steel Pipes in various steel grades, including Grade P2 and P12. These grades are produced using a coarse-grain melting practice, which yields robust and reliable pipes.

Each steel grade has unique properties and advantages, allowing you to choose the one that best suits your needs. Whether you need a pipe with high tensile strength, excellent ductility, or superior resistance to corrosion, we have the steel grade to meet your requirements.

Production Tolerance

Our ASTM A335/A335M standardized Steel Pipes fulfill strict mechanical requirements. These include transverse or longitudinal tension tests, flattening tests, and hardness or bend tests.

These tests ensure that our pipes can withstand the mechanical stresses they will encounter during service. They also ensure that our pipes have the necessary hardness and flexibility to withstand bending, flanging, and similar forming operations.

By meeting these mechanical requirements, we ensure that our pipes can provide you with reliable and long-lasting service, even under demanding conditions.

Why Choose UNIASEN?

Our ASTM A335/A335M standard steel pipes meet stringent chemical composition requirements. This ensures our pipes can withstand high-temperature service.
Our ASTM A335/A335M standard steel pipes come in many sizes. They range from small diameter pipes for complex systems to large diameter ones for industrial uses. They meet our customers’ diverse needs.
Our ASTM A335/A335M standard steel pipes come with detailed specifications including dimensions, production procedures, steel grades, surface coatings, end types, connection methods, and processing services.
The end types and connection methods allow for easy, secure installation. This ensures a smooth integration into your operations.
Machining services can provide custom solutions to meet your needs.