Stainless Steel 317/317L Seamless Pipe | ASTM A312 TP317 / TP317L

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Specifications of SS 317/317L Seamless Pipe 

Item	Range
Standard	ASTM A312 / ASME SA312, TP317, TP317L
European standard	EN 10216-5 (seamless), 1.4438 for 317L
Size range	NPS 1/8 to 12 (10.3 to 323.8 mm OD) in stock sizes; larger hot finished sizes on request
Schedules	Sch 10S, 40S, 80S, 160, XS, XXS
Dimensions	ASME B36.19M; Sch 160 and XXS per ASME B36.10M
Heat treatment	Solution annealed at 1040 °C (1900 °F) min, rapidly cooled
Tests	Tension and flattening on each lot; hydrostatic or nondestructive electric test on every length
Optional tests	Intergranular corrosion to ASTM A262 Practice E; PMI; ultrasonic
Length	Single random (about 5 to 7 m), double random (about 10 to 12 m) or cut to length
Marking	ASTM A312, grade, size, schedule, heat number and “SMLS” on every length
Certificates	EN 10204 3.1; 3.2 through an independent inspector on request

On the purchase order write: ASTM A312 TP317L SMLS - then OD × wall  or NPS and schedule, length and end finish.

Chemical Composition and PREN of TP317 / TP317L

317L carries a 3.0% molybdenum minimum - one full percent more than 316L - which is the primary reason for its superior corrosion resistance.

Element, %	TP317 (S31700)	TP317L (S31703)
Carbon (C)	0.08 max	0.035 max
Manganese (Mn)	2.00 max	2.00 max
Silicon (Si)	1.00 max	1.00 max
Phosphorus (P)	0.045 max	0.045 max
Sulphur (S)	0.030 max	0.030 max
Chromium (Cr)	18.0 to 20.0	18.0 to 20.0
Nickel (Ni)	11.0 to 15.0	11.0 to 15.0
Molybdenum (Mo)	3.0 to 4.0	3.0 to 4.0
Iron (Fe)	Balance	Balance

Pitting resistance equivalent number, PREN = %Cr + 3.3 x %Mo (nitrogen not counted):

Grade	PREN across the specified range
316L	about 23 to 28
317L	about 28 to 33

317L sits roughly five PREN points above 316L - that margin is what prevents pitting in warm chloride and acid service where 316L falls short.

Mechanical Properties of 317/317L Seamless Pipe

Both TP317 and TP317L meet a 205 MPa minimum yield strength in the annealed condition - higher than the 170 MPa minimum for 316L under the same standard.

Property	TP317	TP317L
Tensile strength, min	515 MPa (75 ksi)	515 MPa (75 ksi)
Yield strength (0.2% offset), min	205 MPa (30 ksi)	205 MPa (30 ksi)
Elongation in 50 mm, min	35% longitudinal, 25% transverse	35% longitudinal, 25% transverse
Hardness	No limit set for pipe	No limit set for pipe

316L pipe to ASTM A312 is specified at 485 MPa tensile and 170 MPa yield - walls sized for 317L therefore meet 316L requirements without recalculation.

Physical Properties of SS 317 and 317L Pipe

317/317L expands at 16.5 µm/m·°C between 20 and 100 °C - roughly 50% more than carbon steel - a factor worth accounting for in support spacing and expansion loop design.

Property	Typical value
Density	7.95 g/cm³ (0.287 lb/in³)
Melting range	1370 to 1400 °C
Elastic modulus	193 to 200 GPa
Mean thermal expansion, 20 to 100 °C	16.5 µm/m·°C
Mean thermal expansion, 20 to 500 °C	18.0 µm/m·°C
Thermal conductivity at 100 °C	14.4 W/m·K
Specific heat, 0 to 100 °C	500 J/kg·K
Electrical resistivity at 20 °C	0.79 µΩ·m
Magnetic response, annealed	Non magnetic; slight after cold work

Avoid prolonged holds between 425 and 860 °C in corrosion service. The higher molybdenum content makes 317 grades more susceptible to sigma phase embrittlement than 316 in this range. Scaling resistance in air is good to 870 °C intermittent and 925 °C continuous.

Equivalent Grades for UNS S31700 and S31703 Seamless Pipe

Standard	317	317L
UNS	S31700	S31703
ASTM / ASME	TP317 / SA312 TP317	TP317L / SA312 TP317L
EN / Werkstoff No.	1.4449	1.4438 (X2CrNiMo18-15-4)
JIS	SUS317	SUS317L
BS	317S16	317S12

Equivalents are close matches, not identical specifications. Where a drawing names an EN or JIS grade, order to that standard and check the molybdenum line on the certificate.

316L is 1.4404 / SUS316L; a certificate showing those numbers is not 317L. 

Other forms are separate products: 317/317L welded pipes, 317/317L EFW pipe for large diameters, and 317/317L tubes for heat exchangers, ordered by exact OD and wall.

317/317L Seamless Pipe Sizes and Weight Chart

Sizes from NPS 1/8 to 12 per ASME B36.19M (S schedules) and ASME B36.10M (Sch 160 and XXS). Each cell shows wall thickness in mm and weight in kg/m at 7.95 g/cm³. Sch 5S is a welded wall and is not normally available seamless.

NPS (DN)	OD (mm)	Sch 10S wall / kg/m	Sch 40S wall / kg/m	Sch 80S wall / kg/m	Sch 160 wall / kg/m	XXS wall / kg/m
1/8 (6)	10.3	1.24 / 0.28	1.73 / 0.37	2.41 / 0.47	n/a	n/a
1/4 (8)	13.7	1.65 / 0.50	2.24 / 0.64	3.02 / 0.81	n/a	n/a
3/8 (10)	17.1	1.65 / 0.64	2.31 / 0.85	3.20 / 1.11	n/a	n/a
1/2 (15)	21.3	2.11 / 1.01	2.77 / 1.28	3.73 / 1.64	4.78 / 1.97	7.47 / 2.58
3/4 (20)	26.7	2.11 / 1.30	2.87 / 1.71	3.91 / 2.23	5.56 / 2.94	7.82 / 3.69
1 (25)	33.4	2.77 / 2.12	3.38 / 2.53	4.55 / 3.28	6.35 / 4.29	9.09 / 5.52
1 1/4 (32)	42.2	2.77 / 2.73	3.56 / 3.44	4.85 / 4.52	6.35 / 5.69	9.70 / 7.87
1 1/2 (40)	48.3	2.77 / 3.15	3.68 / 4.10	5.08 / 5.48	7.14 / 7.34	10.15 / 9.67
2 (50)	60.3	2.77 / 3.98	3.91 / 5.51	5.54 / 7.58	8.74 / 11.25	11.07 / 13.61
2 1/2 (65)	73.0	3.05 / 5.33	5.16 / 8.74	7.01 / 11.55	9.53 / 15.11	14.02 / 20.65
3 (80)	88.9	3.05 / 6.54	5.49 / 11.44	7.62 / 15.47	11.13 / 21.62	15.24 / 28.04
4 (100)	114.3	3.05 / 8.47	6.02 / 16.28	8.56 / 22.61	13.49 / 33.97	17.12 / 41.55
5 (125)	141.3	3.40 / 11.71	6.55 / 22.04	9.53 / 31.36	15.88 / 49.74	19.05 / 58.16
6 (150)	168.3	3.40 / 14.00	7.11 / 28.62	10.97 / 43.11	18.26 / 68.43	21.95 / 80.23
8 (200)	219.1	3.76 / 20.22	8.18 / 43.09	12.70 / 65.47	23.01 / 112.69	22.23 / 109.30
10 (250)	273.0	4.19 / 28.13	9.27 / 61.06	12.70 / 82.56	28.58 / 174.47	25.40 / 157.07
12 (300)	323.8	4.57 / 36.44	9.53 / 74.80	12.70 / 98.68	33.32 / 241.73	25.40 / 189.30

Seamless wall can run above nominal, so delivered weight is often a few percent higher. More sizes and schedules are in the SS pipe weight chart.

317L density is 7.95 g/cm³ against 7.98 g/cm³ for 316L seamless pipe - a 0.4% difference that makes the two weight charts interchangeable 

for freight calculations.

Have a 317L seamless size list ready? Send it with grade, schedule, length and quantity through our quotation form and we will reply with a firm offer.

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Dimensional Tolerances on 317/317L Seamless Pipe

All dimensions to ASTM A999. The −12.5% wall tolerance is the most critical figure on inspection -  no point on any length may fall below that limit.

Feature	Allowed variation (ASTM A999)
OD, NPS 1/8 to 1 1/2	+0.4 / −0.8 mm
OD, over NPS 1 1/2 to 4	±0.8 mm
OD, over NPS 4 to 8	+1.6 / −0.8 mm
OD, over NPS 8 to 12	+2.4 / −0.8 mm
Wall thickness	−12.5% of nominal at any point
Length, cut to length	+6 / −0 mm

317/317L Seamless Pipe Applications and Industries

Industry	Typical seamless lines
Flue gas desulphurisation	Scrubber recirculation and spray lines
Pulp and paper	Bleach plant and chemical recovery lines
Chemical and petrochemical	Acetic, phosphoric and dilute sulphuric acid lines; condensers
Power generation	Condenser and brackish cooling water lines
Textile and dye works	Hot acid dye liquor lines
Food and pharmaceutical	Brine and acidic product lines
Ink and pigment production	Corrosive slurry lines

In most of these plants, 316L handles the milder sections - 317L takes over where chloride levels, acid concentration or temperature increases the corrosion risk.

For all forms of the grade, see the 317 / 317L pipe page.

Stainless Steel 317/317L Seamless Pipe FAQs