Stainless Steel 317L Round Bar
➡️ SS 317L | UNS S31703 | EN 1.4438
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Stainless Steel
UNS Number:
S31703
Wr. No.:
1.4438
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 317L Round Bar
Type 317L (UNS S31703) is a low-carbon molybdenum-bearing austenitic stainless steel, supplied mainly to ASTM A276 / A276M and ASTM A479 / A479M with dimensions to ASTM A484 / A484M. European practice specifies it as grade 1.4438 to EN 10088-3.
It sits a clear step above 316L. Molybdenum runs 3.00-4.00% against the 2.00-3.00% of 316L, and nickel is raised to 11.00-15.00% to balance the extra molybdenum and hold the austenitic structure. The result is a pitting resistance equivalent normally around 29-31, against roughly 24 for 316L, which buys better performance in chloride-bearing and sulphurous conditions without moving to a super austenitic grade.
Carbon is capped at 0.035%, so the grade resists sensitisation and can be welded without post-weld heat treatment in most sections.
Bar is supplied solution annealed at roughly 1040-1120 C and quenched fast, hot-finished or cold-finished by drawing, peeling, turning or grinding, in diameters from about 6 mm to 300 mm, random or cut lengths.
The structure is fully austenitic, so annealed bar is non-magnetic and will not harden by heat treatment. Strength comes only from cold work, and cold-finished material is normally re-annealed where full ductility and corrosion resistance are both wanted.
One caution on ordering: 317L and 317LMN are different grades. 317LMN (UNS S31726) carries higher molybdenum and a controlled nitrogen addition, and 317L will not satisfy a specification that calls for it. Check the UNS number rather than the shorthand name.
Most demand comes from flue-gas desulphurisation equipment, pulp and paper bleaching plant, chemical process hardware, condenser and heat-exchanger parts, pump and valve components and machined fittings handling acidic chloride process streams.
Common Applications of Stainless Steel 317L Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for SS 317L Round Bar
Standard
Country / Region
Grade
ASTM A276 / A276M
USA
Type 317L (UNS S31703)
ASTM A479 / A479M
USA
UNS S31703
ASME SA-479
USA
UNS S31703
EN 10088-3
Europe / EU
1.4438 (X2CrNiMo18-15-4)
BS EN 10088-3
United Kingdom
1.4438
JIS G4303
Japan
SUS 317L
GB/T 1220
China
022Cr19Ni13Mo3 (S31703)
KS D 3706
South Korea
STS 317L
ISO 15510
International
X2CrNiMo18-15-4
Technical Specification for Stainless Steel 317L Round Bar
Specification
Value
Unit
Material
Stainless steel
-
Grade
317L / UNS S31703 / 1.4438
-
Product Form
Round bar / rod
-
Standard
ASTM A276 / A276M, ASTM A479 / A479M, EN 10088-3
-
Diameter
6 - 300 (typical supply range)
mm
Length
3 - 6 (random), or cut to length
m
Manufacturing Process
Hot rolled or forged, solution annealed
-
Production Route
EAF + AOD refining, continuous cast or ingot
-
Surface Finish
Hot-rolled and pickled, cold-drawn, peeled, turned, centreless ground, polished
-
Heat Treatment / Delivery Condition
Solution annealed 1040-1120 C, water quenched, EN condition +AT
-
Tolerance Standard
ASTM A484 / A484M, or EN 10060 / EN 10278 in European practice
-
Density
7.98 (typical)
g/cm3
Melting Range
1375 - 1400 (typical)
C
Thermal Conductivity at 100 C
14.4 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
16.5 (typical)
um/m.C
Specific Heat (0-100 C)
500 (typical)
J/kg.K
Electrical Resistivity at 20 C
0.79 (typical)
uOhm.m
Modulus of Elasticity at 20 C
193 (typical)
GPa
Magnetic Properties
Non-magnetic in the solution-annealed condition
-
Pitting Resistance Equivalent (PREN)
29 - 31 (typical, calculated)
-
Testing / Inspection Standard
ASTM A370 for mechanical testing, ASTM A262 Practice E for intergranular corrosion
-
Certification / Inspection Documents
EN 10204 3.1 or 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Stainless Steel 317L Round Bar
Bar comes to ASTM A276 / A276M or ASTM A479 / A479M under UNS S31703, or to EN 10088-3 as 1.4438 in the +AT solution-annealed condition, with ASME SA-479 for pressure-retaining components. Diameter, straightness and surface requirements sit in ASTM A484 / A484M, or EN 10060 and EN 10278 in European practice.
Solution annealing runs 1040-1120 C followed by a fast water quench. The quench matters because the raised molybdenum content leaves the grade more open to sigma and chi phase precipitation than 316L if cooling through 600-950 C is slow, and either phase costs toughness and corrosion resistance.
One point that catches buyers out: 317L and 317LMN are not interchangeable. 317LMN (UNS S31726) carries higher molybdenum and a controlled nitrogen addition, giving a materially higher pitting resistance equivalent. If the specification says 317LMN, ordering 317L will not meet it.
Nothing thermal will harden the grade, so strength can be raised by cold work and nothing else, and cold-finished bar is normally re-annealed where full ductility and corrosion resistance are both wanted.
Supplementary testing that comes up regularly includes ASTM A262 Practice E intergranular corrosion testing, ferrite content checks and ASTM G48 pitting tests where chloride service is critical.
Chemical Composition for Stainless Steel 317L Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.035
%
Manganese
Mn
-
2.00
%
Silicon
Si
-
0.75
%
Phosphorus
P
-
0.045
%
Sulfur
S
-
0.030
%
Chromium
Cr
18.00
20.00
%
Nickel
Ni
11.00
15.00
%
Molybdenum
Mo
3.00
4.00
%
Nitrogen
N
-
0.10
%
Iron
Fe
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for SS 317L Round Bar
Molybdenum at 3.00-4.00% is the reason this grade exists. Raising it from the 2.00-3.00% of 316L strengthens the passive film against localised breakdown, and that shows up directly as better resistance to pitting and crevice corrosion in chloride-bearing and sulphurous media. It carries most of the pitting resistance equivalent of roughly 29-31.
Chromium at 18.00-20.00% creates the protective film itself and handles general corrosion resistance, running a little higher than the 16.00-18.00% of 316L.
Nickel at 11.00-15.00% is raised deliberately. Molybdenum is a strong ferrite former, so without the extra nickel the structure would not stay fully austenitic at this molybdenum level. Nickel also supplies ductility, toughness and resistance in reducing media.
Carbon is capped at 0.035%. Keeping it low means little chromium carbide can precipitate at grain boundaries during welding or hot exposure, so the grade holds its resistance to intergranular attack without stabilising elements or post-weld heat treatment.
Nitrogen up to 0.10% adds modest strength and supports pitting resistance, though it is not a deliberate addition here as it is in 317LMN. Manganese and silicon deoxidise, and phosphorus and sulphur are residuals restricted to protect hot workability and corrosion behaviour.
Mechanical Properties for Stainless Steel 317L Round Bar
Mechanical Property
Value
Unit
Tensile Strength
515
MPa (minimum)
Yield Strength 0.2% Proof
205
MPa (minimum)
Elongation in 50 mm
40
% (minimum, ASTM A276 Condition A)
Elongation in 50 mm, shapes 12.5 mm section and under
30
% (minimum, ASTM A276 footnote)
Reduction of Area
50
% (minimum, ASTM A276 Table 2)
Hardness
192
HBW (maximum, ASTM A479 annealed bar)
Hardness
90
HRB (maximum, ASTM A479 annealed bar)
Tensile Strength, EN 10088-3 condition +AT
500 - 700
MPa (specified range)
Yield Strength 0.2% Proof, EN 10088-3 condition +AT
200
MPa (minimum)
Modulus of Elasticity
193
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 317L Round Bar
Solution-annealed values, all minima, with hardness capping instead and the EN tensile figure given as a range. ASTM and EN requirements differ, so they are listed separately rather than merged. ASTM A370 governs the testing, carried out on material in its delivered condition.
Annealed 317L gives moderate strength with high ductility and toughness, much the same as 316L at room temperature. Nobody specifies this grade for its mechanical properties. It is bought for corrosion resistance, and the tensile numbers are simply what the standard requires the material to demonstrate.
A fully austenitic structure means no ductile-to-brittle transition, so impact toughness holds down to cryogenic temperatures, though ASTM A276 imposes no mandatory Charpy requirement.
Nothing thermal will harden the alloy. Cold drawing raises tensile and proof strength substantially at the cost of elongation, and can leave slight magnetic permeability behind.
Section size is worth watching in heavy bar, where a slower quench from solution temperature can allow intermetallic precipitation that cuts both toughness and corrosion performance. Design should work from the minimum values of the ordered standard and condition.
Dimension / Sizes for Stainless Steel 317L Round Bar
Dimension / Size
Value
Unit
Diameter
6 - 300
mm
Standard Length
3 - 6 (random / mill lengths)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM A484 / A484M, varies with size and finish class
-
Length Tolerance
Per ASTM A484 / A484M or as agreed at order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed at order
-
End Condition
Square cut, chamfered, or as ordered
-
Surface Finish
Hot-rolled and pickled, cold-drawn, peeled, turned, centreless ground, polished
-
Available Size Range
6 - 300, larger diameters by forging on enquiry
mm
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM A484 / A484M, or EN 10060 / EN 10278
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 317L Round Bar
Pricing for Stainless Steel 317L Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Stainless Steel 317L Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
What is Stainless Steel 317L Round Bar?
What is the difference between 317L and 316L?
What standard does Stainless Steel 317L Round Bar comply with?
What are the equivalent grades of Stainless Steel 317L Round Bar?
Is 317L the same as 317LMN?
What are the key mechanical properties of Stainless Steel 317L Round Bar?
Can Stainless Steel 317L Round Bar be welded?
What sizes and lengths are available?
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