What is the difference between 317L and 316L stainless steel?

317L stainless steel has higher molybdenum content than 316L, providing better resistance to pitting and crevice corrosion.

Is Stainless Steel 317L better than 316L?

Yes, Stainless Steel 317L generally performs better than 316L in harsh chemical and chloride-rich environments due to its enhanced corrosion resistance.

Is Stainless Steel 317L corrosion-resistant?

Yes, Stainless Steel 317L offers excellent corrosion resistance, especially in aggressive chemical and chloride environments.

What is the UNS number of Stainless Steel 317L?

The UNS number of Stainless Steel 317L is S31703.

Stainless Steel 317L Products Supplier in India

Q: What is Stainless Steel 317L?

Stainless Steel 317L is a low-carbon austenitic stainless steel with added molybdenum for improved corrosion resistance.

Q: Can SS 317L be welded?

Yes, Stainless Steel 317L can be easily welded, and its low carbon content helps minimize the risk of weld-related corrosion.

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When 316L does not provide enough resistance to chemical attack or chloride pitting, 317L can offer a practical step up without moving immediately to a super-austenitic alloy. Lakshya Steel supplies stainless steel 317L products in flanges, bars, sheets, plates, fittings, structural sections and engineered components for chemical processing, pollution control, pulp and paper, marine and process-equipment requirements.

The grade is identified as UNS S31703 and EN 1.4438. Its low carbon content supports welded fabrication, while the higher molybdenum content improves resistance to pitting and crevice corrosion compared with 316L in many compatible environments. Buyers should specify the product form, dimensions, condition, testing and process medium through the request-a-quote form so the offer can be checked against the correct standard.

Stainless Steel 317L Products Available

Stainless Steel 317L Flanges

Stainless Steel 317L Rod/Bar

Stainless Steel 317L Hex Bar

Stainless steel 317L Square Bar

Stainless Steel 317L Plates/Sheet

Stainless steel 317L channels

Stainless steel 317L H Beam

Stainless steel 317L I Beam

Stainless steel 317L fittings

Stainless Steel 317L Components

317L Grade Identification and Composition

Item	317L Requirement / Reference	Buyer Note
UNS	S31703	Do not use S31700 for the low-carbon grade.
EN / Werkstoff	1.4438	Confirm the specification named on the purchase order.
Carbon	0.030% max	Supports welded fabrication and reduced sensitization risk.
Chromium	18.0-20.0%	Higher than conventional 316L ranges.
Nickel	11.0-15.0%	Supports the austenitic structure.
Molybdenum	3.0-4.0%	Improves resistance to pitting and crevice corrosion.

317L vs 316L Selection Guide

Selection Point	316L	317L	Choose 317L When
Molybdenum	Typically 2.0-3.0%	Typically 3.0-4.0%	The environment needs a higher margin against pitting or chemical attack.
Availability	Broadly available	More specialised	The project specification names 317L or corrosion testing supports it.
Typical use	General chemical, food, marine and process equipment	Chemical, pulp and paper, pollution-control and severe process equipment	316L performance is marginal for the service.
Cost and sourcing	Usually easier to source	Can require project planning	The technical benefit justifies the procurement difference.

Common Standards by Product Form

Product Form	Common Reference	RFQ Detail
Plate, sheet and strip	ASTM A240 / ASME SA240	Thickness, finish, condition and dimensions
Bars and shapes	ASTM A276 / A479	Section, condition, tolerance and length
Forged flanges	ASTM A182	Type, class, facing and dimensions
Butt-weld fittings	ASTM A403	Type, schedule and dimensional standard
Structural sections	Project or applicable dimensional standard	Section size, length and tolerance
Machined components	Drawing and material standard	Dimensions, finish, tolerance and inspection

Industries We Serve

Chemical processing: Tanks, reactors, scrubbers, piping parts and heat exchangers Higher molybdenum content for compatible corrosive media
Pollution control: FGD equipment, ducts, liners and scrubber parts Resistance to chloride-bearing condensates after material review
Pulp and paper: Bleaching and process equipment Resistance to selected process chemicals
Marine and coastal: Hardware, process parts and supports Improved pitting resistance compared with lower-alloy austenitic grades
Food and pharmaceutical: Process equipment where the project specifies 317L Low-carbon weldability and corrosion performance

Testing and Documentation

The RFQ should state the required material test certificate, PMI, mechanical testing, intergranular-corrosion testing, dimensional inspection and any third-party inspection. Compatibility with a chemical or chloride service must be checked against concentration, temperature, contaminants, fabrication and cleaning conditions.

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Frequently Asked Questions:

What is stainless steel 317L?

317L is a low-carbon, molybdenum-bearing austenitic stainless steel identified as UNS S31703. It is selected where corrosion resistance above conventional 316L may be useful, particularly in

What is the difference between 317L and 316L?

317L generally contains more chromium, nickel and molybdenum than 316L. This can improve resistance to pitting and chemical attack in some environments. 316L is more widely available, so the final choice should be based on the process medium, temperature, fabrication and project specification.

Which standards apply to SS 317L products?

ASTM A240 is commonly used for plate and sheet, ASTM A276 or A479 for bars, ASTM A182 for forgings and flanges, and ASTM A403 for butt-weld fittings. The exact standard depends on product form and project requirements.

Can 317L be welded?

The low carbon level helps reduce sensitization risk during welding. Welding procedure, filler selection, heat input, joint design and cleaning still need to match the product form and service. The finished assembly should be reviewed when the process environment is highly corrosive.

Where are stainless steel 317L products commonly used?

Stainless steel 317L products are commonly considered for chemical-processing equipment, pollution-control systems, pulp and paper plants, tanks, scrubbers, heat exchangers and selected marine or coastal components. The process medium, temperature, chloride level, fabrication and cleaning conditions should be reviewed before the grade is specified.

Can SS 317L be welded?

Yes, SS 317L can be easily welded, and its low carbon content helps reduce weld corrosion.