Introduction

Alloy steel is steel blended with alloying elements to enhance mechanical strength, creep resistance, high-temperature stability and pressure bearing capacity. Alloy steel pipe refers to tubular products made of alloy steel. Most high-temperature and pressure critical projects adopt alloy steel seamless pipe without welding seams, avoiding hidden dangers such as weld weakness under harsh working conditions.

ASTM A335 Seamless Alloy Steel Pipe: This specification defines high-temperature service pipe sized by NPS nominal pipe size with fixed standard outer diameters. It covers a wide OD range from 1/2" to 26". Dimensional tolerances are based on percentage of outer diameter, and wall thickness can be ordered to either minimum wall or nominal wall requirements. Tolerance is moderate, designed for field welding, flanging and bending in high-pressure process piping.

ASTM A213 Seamless Alloy Steel Boiler & Heat Exchanger Tube: A213 tubing is specified by actual outer diameter rather than NPS. Most production covers OD up to 5 inches. It adopts tighter OD tolerance limits than A335 to guarantee reliable tube sheet expansion for heat exchanger bundles. Cold-drawn A213 tubing normally carries ±10% wall thickness tolerance, suitable for boilers, superheaters and heat transfer equipment.

ASTM A519 Seamless Mechanical Alloy Steel Tubing: A519 mechanical tubing is marked with true outer diameter and available in round, square and rectangular shapes. It is separated into hot-finished and cold-finished grades. Cold-finished A519 provides the strictest dimensional accuracy among the three standards. The tight tolerance allows subsequent machining, turning and honing for hydraulic cylinders, bushings and general mechanical components.

Key Summary for Buyer Selection:Large diameter high-temperature process pipeline → ASTM A335Boiler tubes, heat exchanger bundle tubes requiring expansion connection → ASTM A213Tubing for mechanical cutting, machining and structural parts → ASTM A519

Properties

The tables list chemical composition and mechanical property requirements for ASTM A335, ASTM A213 and ASTM A519 alloy steel seamless products.

ASTM A335 adopts P-series ferritic alloy grades for high-temperature pressure piping. Corresponding T-series grades under.

ASTM A213 share identical chemical composition but follow adjusted mechanical test rules for boiler and heat exchanger tubes. Even with matching material chemistry, A335 pipe and A213 tube cannot be freely interchanged for pressure equipment.

ASTM A519 mechanical tubing covers carbon & alloy grades optimised for machining and structural use, with property specifications not designed for high-temperature pressure service.

ASTM ASME (S)A-335/(S)A-335M Grade and chemical composition

Grade	UNS	C ≤	Mn	P ≤	S ≤	Si ≤	Cr	Mo
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	0.30–0.60	0.025	0.025	0.50	4.00–6.00	0.44–0.65
P5b	K51545	0.15	0.30–0.60	0.025	0.025	1.00–2.00	4.00–6.00	0.44–0.65
P5c	K41245	0.12	0.30–0.60	0.025	0.025	0.50	4.00–6.00	0.44–0.65
P9	S50400	0.15	0.30–0.60	0.025	0.025	0.50–1.00	8.00–10.00	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	0.50	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	2.65–3.35	0.80–1.60
P22	K21590	0.05–0.15	0.30–0.60	0.025	0.025	0.50	1.90–2.60	0.87–1.13
P91	K91560	0.08–0.12	0.30–0.60	0.020	0.010	0.20–0.50	8.00–9.50	0.85–1.05
P92	K92460	0.07–0.13	0.30–0.60	0.020	0.010	0.50	8.50–9.50	0.30–0.60

Note: (S)A335 P91 other chemical composition: V 0.18–0.25; N 0.030–0.070; Ni ≤ 0.40; Al ≤ 0.04; Nb 0.06–0.10.
(S)A335 P92 other chemical composition: V 0.15–0.25; N 0.030–0.070; Ni ≤ 0.40; Al ≤ 0.04; Nb 0.04–0.09; W 1.5–2.00; B 0.001–0.006.

Standard: ASME SA 335 — American Society of Mechanical Engineers; ASTM A335M — American Society for Testing and Materials
Uses: For manufacture of wall panels, economizers, reheaters, superheaters and steam pipelines of boilers.

Grade	UNS Designation	Composition, %
Grade	UNS Designation	Carbon	Manganese	Phosphorus (max)	Sulfur (max)	Silicon	Chromium	Molybdenum
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	0.44–0.65
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	0.03	0.01	0.50 max	1.90–2.60	0.05–0.30
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	0.50 max	8.50–9.50	0.30–0.60

Name: ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing

Application: For mechanical and high-pressure settings, as well as for transporting steam, water and gas.
Size (mm): O.D. 4–26 in.; W.T. 0.315–2.5 in.
Chemical Composition (%)

Grade	C	Mn	P	S	Si	Cr	Mo
1008	≤0.10	0.30–0.50	0.040	0.050	-	-	-
1010	0.08–0.13	0.30–0.60	0.040	0.050	-	-	-
1018	0.15–0.20	0.60–0.90	0.040	0.050	-	-	-
1020	0.18–0.23	0.30–0.60	0.040	0.050	-	-	-
1025	0.22–0.28	0.30–0.60	0.040	0.050	-	-	-
1026	0.22–0.28	0.60–0.90	0.040	0.050	-	-	-
4130	0.28–0.33	0.40–0.60	0.040	0.050	0.15–0.35	0.80–1.10	0.15–0.25
4140	0.38–0.43	0.75–1.00	0.040	0.050	0.15–0.35	0.80–1.10	0.15–0.25

Mechanical Properties

Grade	Condition	Tensile strength	Yield strength	Elongation
1020	CW	≥414	≥483	≥5%
	SR	≥345	≥448	≥10%
	A	≥193	≥331	≥30%
	N	≥234	≥379	≥22%
1025	CW	≥448	≥517	≥5%
	SR	≥379	≥483	≥8%
	A	≥207	≥365	≥25%
	N	≥248	≥379	≥22%
4130	SR	≥586	≥724	≥10%
	A	≥379	≥517	≥30%
	N	≥414	≥621	≥20%
4140	SR	≥689	≥855	≥10%
	A	≥414	≥552	≥25%
	N	≥621	≥855	≥20%

ASTM A213 — Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes
Chemical Composition (%)

Grade	Chemical Composition (%)
	C	Si	Mn	S	P	Cr	Mo
A213 T2	0.10–0.20	0.10–0.30	0.30–0.61	≤0.02	≤0.025	0.50–0.81	0.44–0.65
A213 T11	0.05–0.15	0.50–1.00	0.30–0.60	≤0.02	≤0.025	1.00–1.50	0.44–0.65
A213 T12	≤0.15	≤0.50	0.30–0.61	≤0.02	≤0.025	0.80–1.25	0.44–0.65
A213 T22	0.05–0.15	≤0.50	0.30–0.60	≤0.02	≤0.025	1.90–2.60	0.87–1.13
A213 T23	0.04–0.10	≤0.50	0.10–0.60	≤0.01	≤0.025	1.90–2.60	0.05–0.30
A213 T24	0.05–0.10	0.15–0.45	0.30–0.70	≤0.02	≤0.025	2.20–2.60	0.70–1.10
A213 T91	0.08–0.12	0.20–0.50	0.30–0.60	≤0.01	≤0.02	8.00–9.50	0.85–1.05
A213 T911	0.09–0.13	0.10–0.50	0.30–0.60	≤0.02	≤0.025	8.50–10.50	0.90–1.10

Mechanical Properties

Grade	Tensile strength (MPa)	Yield strength (MPa)	Elongation (%)	Hardness (HRB)
A213 T2	≥415	≥205	-	85
A213 T11	≥415	≥205	-	85
A213 T22	≥415	≥205	-	85
A213 T23	≥510	≥400	≥20	97
A213 T91	≥585	≥415	≥20	25
A213 T92	≥620	≥440	≥20	25
TP304H	≥515	≥205	≥35	90
TP316H	≥515	≥205	≥35	90
TP321H	≥515	≥205	≥35	90
TP347H	≥515	≥205	≥35	90
S30432	≥590	≥235	≥35	95

Specification

The specification of alloy steel pipe

NPS	OD	Sch 40	Sch 80	Sch 160
1/2″	21.3	2.77	3.73	4.75
3/4″	26.7	2.87	3.91	5.56
1″	33.4	3.38	4.55	6.35
1.1/2″	48.3	3.68	5.08	7.14
2″	60.3	3.91	5.54	8.74
3″	88.9	5.49	7.62	11.13
4″	114.3	6.02	8.56	13.49
6″	168.3	7.11	10.97	18.26
8″	219.1	8.18	12.70	23.01
10″	273.1	9.27	15.09	28.58
12″	323.9	10.31	17.48	33.32

Process

Painting & Coating of Alloy Seamless Steel Pipe: Oiled or Black painted to prevent rust

alloy-steel-pipe-manufacturing-process

FAQ

Q1: What are chrome moly alloy steel seamless pipes?

A1: Chrome moly pipe refers to high-temperature alloy seamless steel pipe. Chromium provides oxidation and corrosion resistance, while molybdenum improves creep strength, avoids high-temperature softening and reduces embrittlement. These seamless alloy pipes are designed for rigorous high-temperature and high-pressure industrial working conditions.

Q2: What are the main ASTM standards for high-temperature alloy seamless tubing?

A2: ASTM/ASME SA335: High-temperature seamless alloy steel pipe (P grades: P5, P9, P11, P22, P91, P92) for process pipingASTM/ASME SA213: Boiler & heat exchanger seamless alloy tube (T grades: T11, T22, T91, T92)ASTM A209: Carbonmoly boiler & superheater tubes (T1, T1a, T1b)ASTM A519: Mechanical alloy tubing for machining, not for pressure piping

Q3: What is the key difference between ASTM A213 and ASTM A335?

A3: Many matching T-series (A213) and P-series (A335) grades share identical chemical composition but cannot be freely interchanged. ASTM A213 applies to small-medium diameter tubes for boiler bundles, superheaters and heat exchangers with tight tolerances for tube sheet expansion. ASTM A335 is alloy steel pipe defined by NPS nominal size, commonly larger diameter for main steam pipelines and petrochemical high-pressure process piping.

Q4: What are typical applications for SA335 and SA213 chrome moly products?

A4: SA335 P11/P22/P91 are widely used in power plants for main steam piping, boiler headers; P5/P9 serve refinery high-temperature pipelines. SA213 alloy tubes are mainly used for boiler superheater, reheater and heat exchanger bundles in power, petrochemical and thermal equipment projects.

Q5: What is the maximum service temperature of mainstream Cr-Mo grades?

A5: P11 / T11: up to 538°C P22 / T22: up to 565~580°C P91 / T91: up to 593°C P92 / T92: up to 620°C

Q6: Can chrome moly alloy steel pipes be welded?

A6: Yes. A335 and A213 alloy pipes support bending, flanging and fusion welding. Preheating and mandatory post-weld heat treatment (PWHT) are required to prevent welding zone cracking and restore mechanical performance.

Q7: What test documents and certificates can you provide?

A7: EN 10204 3.1 Mill Test Certificates with full heat number traceability covering chemical composition, mechanical properties, heat treatment and NDT records. EN 10204 3.2 third-party inspection (SGS, BV, TÜV) is available on request.

Q8: What size range do you supply? What is your delivery lead time?

A8: Size range: OD 6–720 mm, wall thickness 0.5–120 mm, standard length 3–16 m. Custom dimensions are acceptable. Common stock grades (P11, P22) ship within 2–3 weeks; customized P91 and special sizes require 4–6 weeks. Rush orders can be arranged with extra cost.

The tables list chemical composition and mechanical property requirements for ASTM A335, ASTM A213 and ASTM A519 alloy steel seamless products.

ASTM A335 adopts P-series ferritic alloy grades for high-temperature pressure piping. Corresponding T-series grades under.

ASTM A213 share identical chemical composition but follow adjusted mechanical test rules for boiler and heat exchanger tubes. Even with matching material chemistry, A335 pipe and A213 tube cannot be freely interchanged for pressure equipment.

ASTM A519 mechanical tubing covers carbon & alloy grades optimised for machining and structural use, with property specifications not designed for high-temperature pressure service.

ASTM ASME (S)A-335/(S)A-335M Grade and chemical composition

Grade	UNS	C ≤	Mn	P ≤	S ≤	Si ≤	Cr	Mo
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	0.30–0.60	0.025	0.025	0.50	4.00–6.00	0.44–0.65
P5b	K51545	0.15	0.30–0.60	0.025	0.025	1.00–2.00	4.00–6.00	0.44–0.65
P5c	K41245	0.12	0.30–0.60	0.025	0.025	0.50	4.00–6.00	0.44–0.65
P9	S50400	0.15	0.30–0.60	0.025	0.025	0.50–1.00	8.00–10.00	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	0.50	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	2.65–3.35	0.80–1.60
P22	K21590	0.05–0.15	0.30–0.60	0.025	0.025	0.50	1.90–2.60	0.87–1.13
P91	K91560	0.08–0.12	0.30–0.60	0.020	0.010	0.20–0.50	8.00–9.50	0.85–1.05
P92	K92460	0.07–0.13	0.30–0.60	0.020	0.010	0.50	8.50–9.50	0.30–0.60

Note: (S)A335 P91 other chemical composition: V 0.18–0.25; N 0.030–0.070; Ni ≤ 0.40; Al ≤ 0.04; Nb 0.06–0.10.
(S)A335 P92 other chemical composition: V 0.15–0.25; N 0.030–0.070; Ni ≤ 0.40; Al ≤ 0.04; Nb 0.04–0.09; W 1.5–2.00; B 0.001–0.006.

Standard: ASME SA 335 — American Society of Mechanical Engineers; ASTM A335M — American Society for Testing and Materials
Uses: For manufacture of wall panels, economizers, reheaters, superheaters and steam pipelines of boilers.

Grade	UNS Designation	Composition, %
Grade	UNS Designation	Carbon	Manganese	Phosphorus (max)	Sulfur (max)	Silicon	Chromium	Molybdenum
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	0.44–0.65
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	0.03	0.01	0.50 max	1.90–2.60	0.05–0.30
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	0.50 max	8.50–9.50	0.30–0.60

Name: ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing

Application: For mechanical and high-pressure settings, as well as for transporting steam, water and gas.
Size (mm): O.D. 4–26 in.; W.T. 0.315–2.5 in.
Chemical Composition (%)

Grade	C	Mn	P	S	Si	Cr	Mo
1008	≤0.10	0.30–0.50	0.040	0.050	-	-	-
1010	0.08–0.13	0.30–0.60	0.040	0.050	-	-	-
1018	0.15–0.20	0.60–0.90	0.040	0.050	-	-	-
1020	0.18–0.23	0.30–0.60	0.040	0.050	-	-	-
1025	0.22–0.28	0.30–0.60	0.040	0.050	-	-	-
1026	0.22–0.28	0.60–0.90	0.040	0.050	-	-	-
4130	0.28–0.33	0.40–0.60	0.040	0.050	0.15–0.35	0.80–1.10	0.15–0.25
4140	0.38–0.43	0.75–1.00	0.040	0.050	0.15–0.35	0.80–1.10	0.15–0.25

Mechanical Properties

Grade	Condition	Tensile strength	Yield strength	Elongation
1020	CW	≥414	≥483	≥5%
	SR	≥345	≥448	≥10%
	A	≥193	≥331	≥30%
	N	≥234	≥379	≥22%
1025	CW	≥448	≥517	≥5%
	SR	≥379	≥483	≥8%
	A	≥207	≥365	≥25%
	N	≥248	≥379	≥22%
4130	SR	≥586	≥724	≥10%
	A	≥379	≥517	≥30%
	N	≥414	≥621	≥20%
4140	SR	≥689	≥855	≥10%
	A	≥414	≥552	≥25%
	N	≥621	≥855	≥20%

ASTM A213 — Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes
Chemical Composition (%)

Grade	Chemical Composition (%)
	C	Si	Mn	S	P	Cr	Mo
A213 T2	0.10–0.20	0.10–0.30	0.30–0.61	≤0.02	≤0.025	0.50–0.81	0.44–0.65
A213 T11	0.05–0.15	0.50–1.00	0.30–0.60	≤0.02	≤0.025	1.00–1.50	0.44–0.65
A213 T12	≤0.15	≤0.50	0.30–0.61	≤0.02	≤0.025	0.80–1.25	0.44–0.65
A213 T22	0.05–0.15	≤0.50	0.30–0.60	≤0.02	≤0.025	1.90–2.60	0.87–1.13
A213 T23	0.04–0.10	≤0.50	0.10–0.60	≤0.01	≤0.025	1.90–2.60	0.05–0.30
A213 T24	0.05–0.10	0.15–0.45	0.30–0.70	≤0.02	≤0.025	2.20–2.60	0.70–1.10
A213 T91	0.08–0.12	0.20–0.50	0.30–0.60	≤0.01	≤0.02	8.00–9.50	0.85–1.05
A213 T911	0.09–0.13	0.10–0.50	0.30–0.60	≤0.02	≤0.025	8.50–10.50	0.90–1.10

Mechanical Properties

Grade	Tensile strength (MPa)	Yield strength (MPa)	Elongation (%)	Hardness (HRB)
A213 T2	≥415	≥205	-	85
A213 T11	≥415	≥205	-	85
A213 T22	≥415	≥205	-	85
A213 T23	≥510	≥400	≥20	97
A213 T91	≥585	≥415	≥20	25
A213 T92	≥620	≥440	≥20	25
TP304H	≥515	≥205	≥35	90
TP316H	≥515	≥205	≥35	90
TP321H	≥515	≥205	≥35	90
TP347H	≥515	≥205	≥35	90
S30432	≥590	≥235	≥35	95

The specification of alloy steel pipe

NPS	OD	Sch 40	Sch 80	Sch 160
1/2″	21.3	2.77	3.73	4.75
3/4″	26.7	2.87	3.91	5.56
1″	33.4	3.38	4.55	6.35
1.1/2″	48.3	3.68	5.08	7.14
2″	60.3	3.91	5.54	8.74
3″	88.9	5.49	7.62	11.13
4″	114.3	6.02	8.56	13.49
6″	168.3	7.11	10.97	18.26
8″	219.1	8.18	12.70	23.01
10″	273.1	9.27	15.09	28.58
12″	323.9	10.31	17.48	33.32

Painting & Coating of Alloy Seamless Steel Pipe: Oiled or Black painted to prevent rust

alloy-steel-pipe-manufacturing-process

Q1: What are chrome moly alloy steel seamless pipes?

A1: Chrome moly pipe refers to high-temperature alloy seamless steel pipe. Chromium provides oxidation and corrosion resistance, while molybdenum improves creep strength, avoids high-temperature softening and reduces embrittlement. These seamless alloy pipes are designed for rigorous high-temperature and high-pressure industrial working conditions.

Q2: What are the main ASTM standards for high-temperature alloy seamless tubing?

A2: ASTM/ASME SA335: High-temperature seamless alloy steel pipe (P grades: P5, P9, P11, P22, P91, P92) for process pipingASTM/ASME SA213: Boiler & heat exchanger seamless alloy tube (T grades: T11, T22, T91, T92)ASTM A209: Carbonmoly boiler & superheater tubes (T1, T1a, T1b)ASTM A519: Mechanical alloy tubing for machining, not for pressure piping

Q3: What is the key difference between ASTM A213 and ASTM A335?

A3: Many matching T-series (A213) and P-series (A335) grades share identical chemical composition but cannot be freely interchanged. ASTM A213 applies to small-medium diameter tubes for boiler bundles, superheaters and heat exchangers with tight tolerances for tube sheet expansion. ASTM A335 is alloy steel pipe defined by NPS nominal size, commonly larger diameter for main steam pipelines and petrochemical high-pressure process piping.

Q4: What are typical applications for SA335 and SA213 chrome moly products?

A4: SA335 P11/P22/P91 are widely used in power plants for main steam piping, boiler headers; P5/P9 serve refinery high-temperature pipelines. SA213 alloy tubes are mainly used for boiler superheater, reheater and heat exchanger bundles in power, petrochemical and thermal equipment projects.

Q5: What is the maximum service temperature of mainstream Cr-Mo grades?

A5: P11 / T11: up to 538°C P22 / T22: up to 565~580°C P91 / T91: up to 593°C P92 / T92: up to 620°C

Q6: Can chrome moly alloy steel pipes be welded?

A6: Yes. A335 and A213 alloy pipes support bending, flanging and fusion welding. Preheating and mandatory post-weld heat treatment (PWHT) are required to prevent welding zone cracking and restore mechanical performance.

Q7: What test documents and certificates can you provide?

A7: EN 10204 3.1 Mill Test Certificates with full heat number traceability covering chemical composition, mechanical properties, heat treatment and NDT records. EN 10204 3.2 third-party inspection (SGS, BV, TÜV) is available on request.

Q8: What size range do you supply? What is your delivery lead time?

A8: Size range: OD 6–720 mm, wall thickness 0.5–120 mm, standard length 3–16 m. Custom dimensions are acceptable. Common stock grades (P11, P22) ship within 2–3 weeks; customized P91 and special sizes require 4–6 weeks. Rush orders can be arranged with extra cost.

Keywords	Alloy Steel pipe, Alloy Steel Seamless Pipe, ASTM A335 Pipe, ASTM A213 Pipe, High Temperature Alloy Pipe, Alloy Boiler Tube
Size Range	Outside Diameter: 1/2" ~ 26"
	Wall Thickness: up to 4", thicker walls available upon request
	Standard Length: 3.0m – 18m
Standards	ASTM/ASME SA335 (High-temperature seamless alloy steel pipe) Grades: P1, P2, P5, P9, P11, P12, P22, P91, P92
	ASTM/ASME SA213 (Boiler & heatex-changeralloy tubes) Grades: T2, T5, T9, T11, T12, T22, T91, T92
	ASTM A519 (Mechanical seamless alloy tubing) Grades: 4130, 4140, 4340
Surface Finishes	Hot rolled black finish, pickled matte surface, normalized finish, anti-rust oil coating. Custom surface treatments are available based on project requirements.

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FAQ

Q1: What are chrome moly alloy steel seamless pipes?

Q2: What are the main ASTM standards for high-temperature alloy seamless tubing?

Q3: What is the key difference between ASTM A213 and ASTM A335?

Q4: What are typical applications for SA335 and SA213 chrome moly products?

Q5: What is the maximum service temperature of mainstream Cr-Mo grades?

Q6: Can chrome moly alloy steel pipes be welded?

Q7: What test documents and certificates can you provide?

Q8: What size range do you supply? What is your delivery lead time?

Q1: What are chrome moly alloy steel seamless pipes?

Q2: What are the main ASTM standards for high-temperature alloy seamless tubing?

Q3: What is the key difference between ASTM A213 and ASTM A335?

Q4: What are typical applications for SA335 and SA213 chrome moly products?

Q5: What is the maximum service temperature of mainstream Cr-Mo grades?

Q6: Can chrome moly alloy steel pipes be welded?

Q7: What test documents and certificates can you provide?

Q8: What size range do you supply? What is your delivery lead time?

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