What payment terms do you offer for bulk SS 347 Seamless Tube orders?

We offer advance payment, partial advance with balance against documents, and letter of credit terms for larger international orders, depending on order value and relationship.

Are SS 347 Seamless Tubes available in custom cut lengths?

Yes, we provide cut-to-length SS 347 Seamless Tubes per your drawing, in addition to standard random and fixed lengths, with tolerance per ASTM A213/A249 limits.

What is the price difference between SS 347 and SS 347H tubes?

SS 347H typically costs slightly more due to controlled carbon content and stricter grain size requirements for elevated temperature service. Exact pricing depends on size and quantity.

Do you provide NABL accredited test reports?

Yes, NABL accredited lab test reports are available on request, covering chemical composition, mechanical properties, and corrosion resistance testing for SS 347 Seamless Tubes.

Stainless Steel 347 Seamless Tubes Manufacturer | SS 347 Seamless Tubes Supplier

USA Piping Solution is a trusted manufacturer and supplier of high quality Stainless Steel 347 Seamless Tubes (or SS 347 Seamless Tubes) according to ASTM A213 and ASME SA213 standards. They are made from niobium and tantalum stabilized austenitic stainless steel and are inherently resistant to sensitization and chromium carbide precipitation and intergranular corrosion after sensitization range exposure. In contrast, the columbium in SS 347 Seamless Tubes combines with carbon before it can combine with the chromium, which then has time to fulfill its corrosive resistance role. These tubes are delivered in the annealed condition and have been 100% hydrostatically tested and are commonly used in petrochemical, nuclear, aerospace and power boiler applications. Common sizes are stocked and custom sizes can be manufactured in short lead time.

SS 347 Seamless Tubes Specifications

Parameter	Details
Grade	SS 347 / SS 347H
Standard	ASTM A213 / ASME SA213
Additional Standards	ASTM A269, ASTM A511, ASTM A376, ASTM A409
Manufacturing Process	Cold Drawn Seamless (CDS), Hot Finished Seamless (HFS)
OD Range	6.35 mm to 101.60 mm
Wall Thickness	0.5 mm to 12.70 mm
Length	Up to 12 m, cut to length or random
Delivery Condition	Solution Annealed
End Finish	Plain End / Beveled End
Surface	2B, BA, Pickled, Electropolished
Test	Hydrostatic, Flattening, Eddy Current, IGC, PMI

SS 347 Seamless Tubes Chemical Composition

Element	SS 347	SS 347H
Carbon (C)	0.08% max	0.04 to 0.10%
Manganese (Mn)	2.00% max	2.00% max
Phosphorus (P)	0.045% max	0.045% max
Sulfur (S)	0.030% max	0.030% max
Silicon (Si)	0.75% max	0.75% max
Chromium (Cr)	17.00 to 19.00%	17.00 to 19.00%
Nickel (Ni)	9.00 to 13.00%	9.00 to 13.00%
Columbium (Nb) + Tantalum (Ta)	10 x C min, 1.10% max	8 x C min, 1.10% max

SS 347 Seamless Tubes Mechanical Properties

Property	SS 347	SS 347H
Ultimate Tensile Strength	515 MPa min	515 MPa min
Yield Strength (0.2% offset)	205 MPa min	205 MPa min
Elongation	40% min	40% min
Reduction in Area	50% min	50% min
Brinell Hardness	217 HB max	217 HB max

SS 347 vs SS 347H Seamless Tubes

Feature	SS 347 Seamless Tubes	SS 347H Seamless Tubes
Carbon Content	0.08% max	0.04 to 0.10%
Primary Use	General high temperature service	Elevated temperature creep service
Grain Size	ASTM 7 or finer	ASTM 7 or coarser (coarse grain preferred)
Typical Temperature Range	Up to 800 deg C	Up to 900 deg C and above
Standards	ASTM A213 TP347	ASTM A213 TP347H
Applications	Heat exchangers, boilers	Power plant superheaters, nuclear reactors

SS 347 Seamless Tube Temperature / Pressure Rating Chart

Size (in.)	SCH	100	200	300	400	500	600	650	700	750
1"	40	3048	2629	2362	2171	2019	1924	1867	1824	1810
1"	80	4213	3634	3265	3002	2791	2659	2580	2528	2501
1"	160	6140	5296	4759	4375	4068	3876	3761	3684	3646
2"	40	1902	1640	1474	1355	1260	1201	1165	1141	1129
2"	80	2747	2369	2129	1957	1820	1734	1682	1648	1631
2"	160	4499	3880	3486	3205	2980	2840	2755	2699	2671
3"	40	1806	1558	1400	1287	1196	1140	1106	1084	1072
3"	80	2553	2202	1979	1819	1691	1612	1564	1532	1516
3"	160	3840	3312	2976	2736	2544	2424	2352	2304	2280
4"	40	1531	1321	1187	1091	1014	967	938	919	909
4"	80	2213	1909	1715	1577	1466	1397	1355	1328	1314
4"	160	3601	3106	2791	2566	2386	2273	2206	2161	2138
5"	40	1342	1158	1040	956	889	847	822	805	797
5"	80	1981	1709	1535	1411	1312	1250	1213	1189	1176
5"	160	3414	2945	2646	2433	2262	2155	2091	2049	2027

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SS 347 Seamless Tube Size and Weight Chart

OD (mm)	Wall Thickness (mm)	Schedule	Size (in.)	Weight (kg/m)
13.72	3.02	80S	1/4	0.81
17.15	3.20	80S	3/8	1.12
21.34	3.73	80S	1/2	1.65
26.67	3.91	80S	3/4	2.23
33.40	6.35	160	1	4.30
42.16	6.35	160	1 1/4	5.69
48.26	5.08	80S	1 1/2	5.49
60.33	8.74	160	2	11.29
73.03	7.01	80S	2 1/2	11.59
88.90	11.13	160	3	21.67
101.60	8.08	80S	3 1/2	18.92
114.30	13.49	160	4	34.05
141.30	15.88	160	5	49.87
168.28	14.27	120	6	54.75
219.08	23.01	160	8	112.97

UNS S34700 Seamless Tube Dimensions

Size (in.)	OD (mm)	OD (in.)	Wall Thickness (in.)	Wall Thickness (mm)
1/2	21.3	0.840	0.065	1.65
3/4	26.7	1.050	0.065	1.65
1	33.4	1.315	0.065	1.65
1 1/4	42.2	1.660	0.065	1.65
1 1/2	48.3	1.900	0.065	1.65
2	60.3	2.375	0.065	1.65
2 1/2	73.0	2.875	0.083	2.11
3	88.9	3.500	0.083	2.11
3 1/2	101.6	4.000	0.083	2.11
4	114.3	4.500	0.083	2.11
5	141.3	5.563	0.109	2.77
6	168.3	6.625	0.109	2.77
8	219.1	8.625	0.109	2.77
10	273.1	10.750	0.134	3.40
12	323.9	12.750	0.156	3.96
14	355.6	14.000	0.156	3.96
16	406.4	16.000	0.165	4.19
18	457.0	18.000	0.165	4.19
20	508.0	20.000	0.188	4.78
22	559.0	22.000	0.188	4.78
24	610.0	24.000	0.218	5.54
30	762.0	30.000	0.250	6.35

Tolerance of SS 347 Seamless Tubes (ASTM A312)

Size	Under (in.)	Over (in.)
1/8 to 1 1/2 in. incl.	1/32 (0.031)	1/64 (0.015)
Over 1 1/2 to 4 in. incl.	1/32 (0.031)	1/32 (0.031)
Over 4 to 8 in. incl.	1/32 (0.031)	1/16 (0.062)
Over 8 to 18 in. incl.	1/32 (0.031)	3/32 (0.093)

SS 347 Seamless Tube Equivalent Grades

Standard	WNR	UNS	EN	GOST	JIS
SS 347	1.4550	S34700	X6CrNiNb18-10	08Ch18N12B	SUS 347

Applications of Stainless Steel 347 Seamless Tubes

Superheater Tubes: Power plant superheaters operating above 700 deg C
Reheater Tubes: Steam reheating circuits in thermal power plants
Refinery Tubes: Crude oil processing, coker units, reformer tubes
Nuclear Service: Fuel rod cladding, coolant circuit tubing
Aerospace Tubing: High temperature hydraulic and exhaust tubing
Heat Exchanger Tubes: Shell and tube exchangers in chemical plants

Frequently Asked Questions

How is pricing calculated for SS 321 Seamless Tubes?

Pricing depends on OD, wall thickness, length, surface finish, and order quantity. Share your full specification and we'll issue a detailed quote within one business day.

What sizes of SS 321 Seamless Tubes are kept in stock?

We stock common sizes from 6.00 mm to 101.60 mm OD in standard schedules. Larger or non-standard sizes can be produced to order with shorter lead times for bulk quantities.

Is third-party inspection available before shipment?

Yes, we arrange third-party inspection through agencies like SGS, BV, or TUV before dispatch, along with dimensional reports and material test certificates for your records.

Can I get a sample length before placing a bulk order?

Yes, sample lengths can be arranged for first-time buyers to verify quality, dimensions, and surface finish before committing to a full production order.

Need SS 347 Seamless Tubes with Mill Certification?

USA Piping Solution provides EN 10204 3.1 certified SS 347 Seamless Tubes with full traceability. We offer fast dispatch from our warehouse stock and custom production for special sizes.

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Stainless Steel 347 Seamless Tubes Manufacturer and Supplier

SS 347 Seamless Tubes Specifications

Types of SS 347 Seamless Tubes