SS 317 317L Seamless Tubes | A213 A312 TP317

Q: ASTM A213 TP317 vs TP317L: which for heat exchanger tubes?

TP317L (0.035% C max) is preferred for HX with welded tube to tubesheet joints. If fully seamless with expanded joints only, TP317 (0.08% C) offers marginally higher strength at temperature.

Q: Is dual certified 317/317L seamless tube available?

Yes. We offer dual certified SS 317/317L seamless tubes meeting both TP317 and TP317L chemistry and mechanical requirements on a single mill test certificate.

USA Piping Solutions is trusted and reputed stainless steel 317 seamless tubes supplier and exporter in USA. We have ready stock of SS 317L seamless tube that comprises of ASTM A213 TP317 seamless tube for boiler & heat exchanger application and ASTM A312 TP317L seamless pipe for high pressure process pipe. We offer UNS S31700 seamless tube and UNS S31703 seamless tube in full mill test certified, solution annealed condition and conforming to ASTM and ASME.Every lot of 1.4449 seamless stainless tube ships hydrotested and ready for immediate installation.

Stainless Steel 317 / 317L Seamless Tubes Seamless Specifications

The table below summarizes key specifications for our stainless steel 317 seamless tubes. These products carry ASME SA213 TP317 / SA312 TP317 designations for coded pressure equipment. For the complete 317/317L product range including welded forms, visit our Stainless Steel 317 Tubes hub page. Browse all grades in our Stainless Steel Pipes & Tubes master category.

Specification	Details
Standard	ASTM A213 / ASTM A312
ASME Equivalent	ASME SA213 TP317 / SA312 TP317
Grade	TP317 / TP317L
UNS Number	UNS S31700 (317) / UNS S31703 (317L)
DIN / EN	1.4449 (317) / 1.4438 (317L)
Type	Seamless
Pipe OD Range	1/2" to 8" NB
Tube OD (A213)	6 mm to 76 mm
Wall Thickness	Sch 5S through XXS
Form	Round Seamless Tubes and Pipes

Seamless vs Welded SS 317L Specification Comparison

The table below compares seamless (A213) and welded (A249) specifications for ASTM A213 TP317 seamless tube. Use this to determine the correct form for your application.

Property	SS 317 Seamless (A213)	SS 317L Welded (A249)	Key Difference
Standard	ASTM A213	ASTM A249	Different specs; A213 is seamless only
Weld Seam	None	Present (100% hydrotest)	Seamless eliminates seam sensitization risk
OD Tolerance	±0.5%	±1.0%	Seamless tighter for TEMA Class R fit up
ASME Sec I / VIII	Yes, standard choice	Conditional acceptance	Seamless mandatory for boiler service
Cost	Higher	Lower (~20% saving)	Seamless premium for critical service

Chemical Composition of SS 317 / 317L Seamless Tubes

The table below provides the chemical composition for both UNS S31700 seamless tube (317) and UNS S31703 (317L) grades. Our Stainless Steel Seamless Pipes & Tubes range includes these and other premium austenitic alloys.

Element	Range / Limit	Why It Matters
Carbon (C)	0.08% max (317) / 0.035% max (317L)	317L essential for welded assemblies; both available seamless
Chromium (Cr)	18.0–20.0%	Provides base corrosion and oxidation resistance
Nickel (Ni)	11.0–15.0%	Higher Ni floor than 316 for improved stability
Molybdenum (Mo)	3.0–4.0%	Core pitting resistance advantage over 316L
Manganese (Mn)	2.00% max	Supports hot workability
Silicon (Si)	1.00% max	Enhances scaling resistance

Mechanical Properties of SS 317 / 317L Seamless Tubes

Values below apply to solution annealed seamless tubes. Both MPa and ksi are shown.

Grade / Condition	Yield (MPa / ksi)	UTS (MPa / ksi)	Elongation %	Hardness
317 Annealed Seamless	205 / 30	515 / 75	≥40	—
317L Annealed Seamless	205 / 30	515 / 75	≥40	—

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Stainless Steel 317L Seamless Tubes Types

317L stainless steel capillary tube

317L Stainless Steel Round Tube

317L Stainless Steel Tube

ASTM A213 TP 317L Rectangular Tube

SA 213 TP 317L Stainless Steel Condenser Tube

SS 317L High Precision Tube

Stainless Steel 317L Seamless Tubes

Stainless Steel 317L Welded Tube

Why ASTM A213 Seamless is Mandatory for Certain SS 317 Applications

ASTM A213 TP317 covers seamless austenitic alloy steel boiler, superheater, and heat exchanger tubes exclusively. It does not apply to welded tubes. For SS 317L in boiler and superheater service governed by ASME Section I or pressure vessel service under ASME Section VIII, A213 seamless is the mandatory specification call out.

Beyond code requirements, seamless SS 317L seamless tube provides tighter OD tolerance of ±0.5% compared to ±1.0% for welded tube. This dimensional precision is critical for close tube sheet fit up in TEMA Class R heat exchangers, where the tube to tubesheet joint integrity depends on accurate OD sizing. Seamless production also eliminates the weld seam, removing any sensitization risk in the as delivered condition.

When ASME code does not mandate seamless and the application does not require tight OD tolerance, Stainless Steel 317 Welded Tubes under ASTM A249 offer a 20% cost saving with full hydrotest assurance.

317L Stainless Steel Seamless Tubes Tolerances

Diameter Tolerance

NPS	Stainless Steel 317L Tube OD Tolerance
	+		–
	inch	mm	inch	mm
1/8~1 1/2	1/64(0.015)	0.4	1/32(0.031)	0.8
> 1 1/2~4	1/32(0.031)	0.8	1/32(0.031)	0.8
> 4~8	1/16(0.062)	1.6	1/32(0.031)	0.8
> 8~18	3/32(0.093)	2.4	1/32(0.031)	0.8
> 18~26	1/8(0.125)	3.2	1/32(0.031)	0.8
> 26~34	5/32(0.156)	4.0	1/32(0.031)	0.8
> 34~48	3/16(0.187)	4.8	1/32(0.031)	0.8

Wall Thickness Tolerance

NPS	Stainless Steel 317l Tube Tolerance, %
NPS	+	–
1/8-2 1 /2	20.0	12.5
3~18, t/D≤ 5%	22.5	12.5
3~18, t/D> 5%	15.0	12.5
≥ 20, welded	17.5	12.5
≥ 20, seamless, t/D≤ 5%	22.5	12.5
≥ 20, seamless, t/D> 5%	15.0	12.5

Stainless Steel 317 / 317L Seamless Tube Pressure Rating Chart

Stainless Steel 317L Seamless Tube O.D. (in.)	Wall Thickness of Stainless Steel 317L Seamless Tube (inches)
	.028	.035	.049	.065	.083	.095	.109	.120
	Working Pressure (psig)
1/8	7900	10100
1/4	3700	4800	7000	9500
5/16		3700	5400	7300
3/8		3100	4400	6100
1/2		2300	3200	4400
3/4			2200	3000	4000	4600
1				2200	2900	3400	3900	4300

317/317L Stainless Steel Seamless Tube Dimensions

Pipe Size	OD (in)	5s	5	10s	10	20	30	40s / Std.	40	60	80s / E.H.	80	100	120	140	160	DBL E.H.
Pipe Size	OD (in)	Schedule 5		Schedule 10		Schedule 20/30		Schedule 40		Sch 60	Schedule 80		100	120	140	160	DBL XH
1/8	.405	.035 .1383	.049 .1863	.049 .1863	—	—	—	.068 .2447	.068 .2447	—	.095 .3145	.095 .3145	—	—	—	—	—
1/4	.540	—	.049 .2570	.065 .3297	.065 .3297	—	—	.088 .4248	.088 .4248	—	.119 .5351	.119 .5351	—	—	—	—	—
3/8	.675	—	.049 .3276	.065 .4235	.065 .4235	—	—	.091 .5676	.091 .5676	—	.126 .7338	.126 .7338	—	—	—	—	—
1/2	.840	.065 .5383	.065 .5383	.083 .6710	.083 .6710	—	—	.109 .8510	.109 .8510	—	.147 1.088	.147 1.088	—	—	—	.187 1.304	.294 1.714
3/4	1.050	.065 .6838	.065 .6838	.083 .8572	.083 .8572	—	—	.113 1.131	.113 1.131	—	.154 1.474	.154 1.474	—	—	—	.218 1.937	.308 2.441
1	1.315	.065 .8678	.065 .8678	.109 1.404	.109 1.404	—	—	.133 1.679	.133 1.679	—	.179 2.172	.179 2.172	—	—	—	.250 2.844	.358 3.659
1-1/4	1.660	.065 1.107	.065 1.107	.109 1.806	.109 1.806	—	—	.140 2.273	.140 2.273	—	.191 2.997	.191 2.997	—	—	—	.250 3.765	.382 5.214
1-1/2	1.900	.065 1.274	.065 1.274	.109 2.085	.109 2.085	—	—	.145 2.718	.145 2.718	—	.200 3.631	.200 3.631	—	—	—	.281 4.859	.400 6.408
2	2.375	.065 1.604	.065 1.604	.109 2.638	.109 2.638	—	—	.154 3.653	.154 3.653	—	.218 5.022	.218 5.022	—	—	—	.343 7.444	.436 9.029
2-1/2	2.875	.083 2.475	.083 2.475	.120 3.531	.120 3.531	—	—	.203 5.793	.203 5.793	—	.276 7.661	.276 7.661	—	—	—	.375 10.01	.552 13.70
3	3.500	.083 3.029	.083 3.029	.120 4.332	.120 4.332	—	—	.216 7.576	.216 7.576	—	.300 10.25	.300 10.25	—	—	—	.437 14.32	.600 18.58
3-1/2	4.000	.083 3.472	.083 3.472	.120 4.973	.120 4.973	—	—	.226 9.109	.226 9.109	—	.318 12.51	.318 12.51	—	—	—	—	.636 22.85
4	4.500	.083 3.915	.083 3.915	.120 5.613	.120 5.613	—	—	.237 10.79	.237 10.79	.281 12.66	.337 14.98	.337 14.98	—	.437 19.01	—	.531 22.51	.674 27.54
4-1/2	5.000	—	—	—	—	—	—	.247 12.53	—	—	.355 17.61	—	—	—	—	—	.710 32.53
5	5.563	.109 6.349	.109 6.349	.134 7.770	.134 7.770	—	—	.258 14.62	.258 14.62	—	.375 20.78	.375 20.78	—	.500 27.04	—	.625 32.96	.750 38.55
6	6.625	.109 7.585	.109 7.585	.134 9.290	.134 9.290	—	—	.280 18.97	.280 18.97	—	.432 28.57	.432 28.57	—	.562 36.39	—	.718 45.30	.864 53.16
7	7.625	—	—	—	—	—	—	.301 23.57	—	—	.500 38.05	—	—	—	—	—	.875 63.08

Applications of Stainless Steel 317 / 317L Seamless Tubes

The combination of high Mo content and seamless construction makes stainless steel 317 seamless tubes the right choice for:

Boiler and superheater tubes (ASTM A213 mandatory per ASME Section I).
High pressure chemical reactor tubes in aggressive acid environments.
FGD system tubes requiring superior pitting resistance.
Pulp and paper bleach plant heat exchangers requiring seamless form.
Pharmaceutical and food processing equipment with stringent hygiene requirements.
For boiler and heat exchanger specific products, visit Boiler & Heat Exchanger Tubes.

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Frequently Asked Questions

Q1: ASTM A213 TP317 vs TP317L: which for heat exchanger tubes?

TP317L (0.035% C max) is preferred for heat exchangers involving welded tube to tubesheet joints. If the exchanger is fully seamless with expanded joints only, TP317 (0.08% C) offers marginally higher strength at temperature.

Q2: Is SS 317L seamless tube NACE compliant?

Yes. SS 317L seamless tube in solution annealed condition meets NACE MR0175 / ISO 15156 for sour gas service. We supply with NACE compliance certification and full material traceability on request.

Q3: Is dual certified 317/317L seamless tube available?

Yes. We offer dual certified SS 317/317L seamless tubes that meet both TP317 and TP317L chemistry and mechanical requirements on a single mill test certificate for maximum procurement flexibility.

Stainless Steel 317 / 317L Seamless Tubes Supplier USA| ASTM A213 A312 TP317