310 Stainless Steel Tube: 310S and 310H Seamless and Welded Tubing

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What 310 Stainless Steel Tube?

Grade 310 is a 25% chromium, 20% nickel austenitic stainless steel built for oxidation resistance at high temperature. It comes in three variants, and choosing the right one matters more than any other line on the purchase order.

Variant	UNS	Carbon	Choose it for
310	S31000	0.25% max	General heat resisting parts; rarely ordered as pressure tube
310S	S31008	0.08% max	Welded fabrications and furnace parts where weldability matters
310H	S31009	0.04 to 0.10%	Creep loaded pressure parts

310S Stainless Steel Tube Specifications

Item	Detail
Specifications	ASTM A213, A249, A269, A312 / ASME SA213, SA249, SA269, SA312
Dimensions	ASTM A1016 for tube; ASME B36.19M and B36.10M for pipe
Seamless Tube Size	3.35 mm OD To 101.6 mm OD
Welded Tube Size	6.35 mm OD To 152 mm OD
Outside Diameter	Tube 3.2 mm to 127 mm; pipe 10.3 mm to 323.8 mm (NPS 1/8 to NPS 12, DN 6 to DN 300)
Length	Single random, double random and cut length; 5.8 m and 11.8 m for 20 ft and 40 ft containers
Thickness	0.4 mm to 12.7 mm (0.015 in to 0.500 in), minimum or average wall
Schedule	Sch 5S, 10S, 40S, 80S, 160, XS, XXS
Type	Seamless, welded, ERW, EFW
Form	Round, U bend, coiled, straight length
Ends and Finish	Plain or bevelled end; annealed and pickled, bright annealed, polished
Heat Treatment	Solution annealed, 1040 °C (1900 °F) minimum, rapidly cooled
Testing	Hydrostatic or NDE, flattening, flaring, hardness, tensile
Certificate	EN 10204 3.1 or 3.2

Note: Each tube marked with standard, grade, OD × wall, length, heat number and manufacturer’s mark, or to customer requirement.

Need a 310S tube size that is not listed? Send your OD, wall and length and we will confirm availability within one working day.

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310h and 310S Tube Chemical Composition

Grade	C	Mn max	P max	S max	Si max	Cr	Ni
TP310S (S31008)	0.08 max	2.00	0.045	0.030	1.00	24.0 to 26.0	19.0 to 22.0
TP310H (S31009)	0.04 to 0.10	2.00	0.045	0.030	1.00	24.0 to 26.0	19.0 to 22.0

Mechanical Properties of 310S and 310H Tube

Property	TP310S	TP310H
Tensile strength, min	515 MPa (75 ksi)	515 MPa (75 ksi)
Yield strength 0.2%, min	205 MPa (30 ksi)	205 MPa (30 ksi)
Elongation in 50 mm, min	35%	35%
Hardness max, A213	192 HBW / 90 HRB	192 HBW / 90 HRB
Hardness max, A249	90 HRB	90 HRB

Physical Properties of 310S Stainless Steel

Property	Metric
Density	7.9 g/cm³
Elastic modulus	200 GPa
Thermal expansion, 0 to 100 °C	15.9 µm/m·°C
Thermal conductivity at 100 °C	14.2 W/m·K
Specific heat	500 J/kg·K
Electrical resistivity	0.78 µΩ·m
Melting range	1400 to 1450 °C

Equivalents for ss 310s/310h/310 Tube

Grade	UNS	EN / W.Nr	EN name	JIS
310S	S31008	1.4845	X8CrNi25-21	SUS310S
310	S31000	1.4841 (approximate; higher Si)	X15CrNiSi25-21	SUS310
310H	S31009	No exact equivalent

310S Tube Weight per Metre

OD (in)	Wall (mm)	Wall (BWG)	Wall (in)	Weight (kg/m)	Weight (lb/ft)	Per 6 m length (kg)
1/2	1.24	18	0.049	0.354	0.238	2.12
3/4	1.65	16	0.065	0.715	0.480	4.29
3/4	2.11	14	0.083	0.890	0.598	5.34
1	1.65	16	0.065	0.976	0.656	5.86
1	2.11	14	0.083	1.224	0.823	7.34
1 1/4	2.11	14	0.083	1.558	1.047	9.35
1 1/2	2.11	14	0.083	1.892	1.271	11.35
2	2.77	12	0.109	3.314	2.227	19.88

Note: Calculated as (OD − wall) × wall × 0.02491 kg/m. Actual weight varies with wall tolerance; minimum wall tube runs heavier than average wall.

Certification, Packing and Delivery of 310 Stainless Steel Tube

You can request EN 10204 3.1 or 3.2 certificates. The inspection agency and lead time are confirmed at quotation.

For sea freight and laydown, specify:

• End caps on every tube
• Wooden boxes for thin wall tube
• Strapping that never puts carbon steel against the stainless surface
• Covered storage away from sand, sun and coastal salt

310 and 310S Tube: Frequently Asked Questions