ASTM A213 Alloy Seamless Steel Tube Specifications

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Update time : 2026-02-24 08:40:24

　　ASTM A213 steel tubes is a standard developed by the American Society for Testing and Materials (ASTM) for seamless alloy steel and stainless steel tubes used in boilers, superheaters, and heat exchangers. It is widely used in high-temperature and high-pressure applications. This standard covers a variety of ferritic and austenitic alloy steel grades and is considered a key material standard, especially in power plant boilers, petrochemical plants, oil refining units, and heat exchange systems.

　　Compared to ordinary carbon steel tubes, ASTM A213 alloy seamless steel tubes exhibit superior performance in high-temperature resistance, oxidation resistance, and creep resistance, maintaining stable mechanical properties under long-term high-temperature operation.

　　ASTM A213 Alloy Seamless Steel Tube Specification Range

　　1. Outer Diameter (OD) Range

　　ASTM A213 does not have a strict upper limit on tube dimensions, but commonly used industry specifications are:

　　Outer Diameter Range:

　　6.35 mm (1/4") – 127 mm (5")

　　Tubes for boilers and heat exchangers typically fall within the smaller diameter range.

　　2. Wall Thickness (WT) Range

　　Minimum Wall Thickness: Approximately 0.9 mm

　　Maximum Wall Thickness: Typically not exceeding 22% of the outer diameter

　　Common wall thickness ranges from 1.0 mm to 12 mm, depending on pressure and temperature design requirements.

　　3. Length Forms

　　Fixed Length

　　Random Length

　　U-bend Tubes (for heat exchangers)

Item	Description
Product Type	Seamless Steel Pipe
Size Range	1/8” – 48” / DN 6 – DN 1200
Wall Thickness	SCH 20 – SCH 160, XXS
Length	6 m, 12 m, or Random Length
Standard	ASME B36.10
Surface Treatment	Blasting and Painting, Epoxy Powder (FBE), 2PE, 3PE Coating
Material Grades	ASTM A213 T11 / T12 / T22 / T5 / T9 / T91 / T92

　　Dimensions of alloy seamless steel pipes

DN	NPS	OD	SCH10	SCH20	SCH30	STD	SCH40	SCH60	XS	SCH80
6	1/8	10.3	1.24	-	1.45	1.73	1.73	-	2.41	2.41
8	1/4	13.7	1.65	-	1.85	2.24	2.24	-	3.02	3.02
10	3/8	17.1	1.65	-	1.85	2.31	2.31	-	3.2	3.2
15	1/2	21.3	2.11	-	2.41	2.77	2.77	-	3.73	3.73
20	3/4	26.7	2.11	-	2.41	2.87	2.87	-	3.91	3.91
25	1	33.4	2.77	-	2.9	3.38	3.38	-	4.55	4.55
32	1 1/4	42.2	2.77	-	2.97	3.56	3.56	-	4.85	4.85
40	1 1/2	48.3	2.77	-	3.18	3.68	3.68	-	5.08	5.08
50	2	60.3	2.77	-	3.18	3.91	3.91	-	5.54	5.54
65	2 1/2	73	3.05	-	4.78	5.16	5.16	-	7.01	7.01
80	3	88.9	3.05	-	4.78	5.49	5.49	-	7.62	7.62
90	31/2	101.6	3.05	-	4.78	5.74	5.74	-	8.08	8.08
100	4	114.37	3.05	-	4.78	6.02	6.02	-	8.56	8.56

　　ASTM A213 alloy seamless steel tubes, with their stable chemical composition and stringent manufacturing and inspection requirements, have become a core material standard in the global boiler and heat exchanger industry. Whether for conventional power plant boilers or high-parameter supercritical plants, ASTM A213 alloy steel tubes provide reliable heat resistance and pressure resistance.Email: pipe@stpipefitting.cn

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