ASTM A312 Stainless Steel Seamless Pipe

YES Stainless International supplies ASTM A312 stainless steel seamless pipe for pressure and general industrial service. We offer stainless steel seamless pipe in 304/304L and 316/316L, sized to ASME B36.19M with common schedules 5S, 10S, 40S, and 80S. Pipes are furnished annealed with AP or BA surfaces and delivered with EN 10204 3.1 MTC, dimensional reports, and hydrostatic or eddy-current (ECT) testing as specified. Controlled straightness and ovality, plus clean, plain, or beveled ends, support reliable fabrication, while export-ready packing protects the finish from dispatch to delivery.

What is ASTM A312 Seamless Pipe?

An ASTM A312 seamless pipe is a stainless steel seamless pipe produced by piercing a solid billet and then hot-working or cold-drawing to the final size, with no longitudinal weld seam. This construction promotes smooth internal bores, uniform strength, and dependable performance in higher-pressure, high-temperature, or cleanliness-sensitive applications. It is commonly chosen for chemical processing, steam and condensate lines, clean water and gas distribution, and other duties where a seam is undesirable or design margins are tight. Select A312 seamless pipes when pressure integrity, fatigue resistance, or bore cleanliness lead the specification.

Product Overview of ASTM A312 Stainless Steel Pipe

Stainless Steel Grade	Dimension	Inspection & Test
TP304, TP304L, TP316L, SUS304TP, and others	OD: 1/4"~30" WT: SCH5S~SCH80S Standard Length: 6M	Chemical composition, mechanical properties, hydrostatic, dimensional, and others per PO/ITP

Key Features of ASTM A312 Stainless Seamless Pipe

Seamless Construction: No weld seam for strong wall integrity, smooth IDs, and reliable pressure performance.
Dimensional Stability: Pipes supplied to ASME B36.19M with controlled OD, wall, ovality, and straightness.
ASTM-Compliant Verification: Chemical & mechanical results with hydrostatic, dimensional, and appearance checks documented for each lot.
Clean, weld-ready ends: Supplied plain or beveled, with end prep matching your welding procedure.
Annealed Condition: Ductility and toughness restored for bending, expanding, and fabrication.
Export-Ready Packaging: End caps, film wrap, and moisture control help protect surfaces during sea freight and handling.

Product Specification of of ASTM A312 Stainless seamless Pipe

Outside Diameter			ASME B36.19M Thickness (mm)				ASME B16.10M Thickness (mm)
DN	inch	mm	SCH 5S	SCH 10S	SCH 40S	SCH 80S	SCH 5	SCH 10	SCH 20	STD	XS
8	¼"	13.7	-	1.65	2.24	3.02	-	1.65	-	2.24	3.02
10	⅜"	17.1	-	1.65	2.31	3.20	-	1.65	-	2.31	3.20
15	½"	21.3	1.65	2.11	2.77	3.73	1.65	2.11	-	2.77	3.73
20	¾"	26.7	1.65	2.11	2.87	3.91	1.65	2.11	-	2.87	3.91
25	1"	33.4	1.65	2.77	3.38	4.55	1.65	2.77	-	3.38	4.55
32	1 ¼"	42.2	1.65	2.77	3.56	4.85	1.65	2.77	-	3.56	4.85
40	1 ½"	48.3	1.65	2.77	3.68	5.08	1.65	2.77	-	3.68	5.08
50	2"	60.3	1.65	2.77	3.91	5.54	1.65	2.77	-	3.91	5.54
65	2 ½"	73.0	2.11	3.05	5.16	7.01	2.11	3.05	-	5.16	7.01
80	3"	88.9	2.11	3.05	5.49	7.62	2.11	3.05	-	5.49	7.62
90	3 ½"	101.6	2.11	3.05	5.74	8.08	2.11	3.05	-	5.74	8.08
100	4"	114.3	2.11	3.05	6.02	8.56	2.11	3.05	-	6.02	8.56
125	5"	141.3	2.77	3.40	6.55	9.53	2.77	3.40	-	6.55	9.53
150	6"	168.3	2.77	3.40	7.11	10.97	2.77	3.40	-	7.11	10.97
200	8"	219.1	2.77	3.76	8.18	12.7	2.77	3.76	6.35	8.18	12.7
250	10"	273.1	3.4	4.19	9.27	12.7	3.4	4.19	6.35	9.27	12.7
300	12"	323.9	3.96	4.57	9.53	12.7	3.96	4.57	6.35	9.53	12.7
350	14"	355.6	3.96	4.78	-	12.7	3.96	6.35	7.91	9.53	12.7
400	16"	406.4	4.19	4.78	-	12.7	4.19	6.35	7.92	9.53	12.7
450	18"	457.2	4.19	4.78	-	12.7	4.19	6.35	7.92	9.53	12.7
500	20"	508	4.78	5.54	-	12.7	4.78	6.35	9.53	9.53	12.7
550	22"	558.8	4.78	5.54	-	-	4.78	6.35	9.53	9.53	12.7
600	24"	609.6	5.54	6.35	-	12.7	5.54	6.35	9.53	9.53	12.7
650	26"	660.4	-	-	-	-	-	7.92	12.7	9.53	12.7
700	28"	711.2	-	-	-	-	-	7.92	12.7	9.53	12.7
750	30"	762	6.35	7.92	-	-	6.35	7.92	12.7	9.53	12.7

FAQs

1. What is the practical difference between A312 seamless and welded pipe?

A312 seamless pipe has no weld seam, offering strong wall integrity and smooth IDs—useful for higher pressure, higher temperature, or cleanliness-sensitive service. Welded pipe is cost-efficient for many utilities and larger diameters.

2. Which schedules do you offer for A312 seamless pipe?

Common schedules include 5S, 10S, 40S, and 80S. Other schedules can be reviewed with your inquiry.

3. Can you supply fixed lengths and specific end preparations?

Yes. We provide fixed lengths and plain or beveled ends as specified in your PO/ITP.

4. What tests and documents are included?

We can provide EN 10204 3.1 MTC, dimensional reports, and hydrostatic and/or eddy current (ECT) test certificates as specified. Acceptance criteria are agreed in advance.

5. Which grades should I choose, 304/304L or 316/316L?

Select 304/304L for general service and 316/316L for applications requiring additional chloride resistance. We can advise based on your media and operating conditions.