317(Cr-Ni-Mo)

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1. Introduce

– Higher content of Cr, Ni, and Mo than 304, 304L, 316, and 316L for improved corrosion and pitting resistance

– Has the best corrosion resistance, high-temperature tensile strength, and creep strength of all 300 series stainless steels

– Strength cannot be improved by heat treatment; strength is increased by cold work hardening

– UNS S31700

* 304 vs 316 vs 317 Comparison

: Alloy characterized by high strength and corrosion resistance due to the addition of high concentration of Cr and Ni

Chemical Composition	304	316	317
Cr	18.0~20.0	16.0~18.0	18.0~20.0
Ni	8.0~10.5	10.0~14.0	11.0~15.0
Mo	–	2.0~3.0	3.0~4.0

	304	316	317
PREN value	21	24	29
Characteristic	Provides excellent corrosion resistance in general environments	Provides excellent corrosion resistance in marine, atmospheric, and chloride environments	Used in extreme environments with exposure to corrosive chemicals and acids due to improved corrosion resistance over 304 and 316

* UNS

Abbreviation for the Unified Numbering System for Metals and Alloys
Unified unique numbering system for metals and alloys
A representative number compatible with metals and alloys defined in several material-related codes, including ASTM, AISI, ASME, AWS, etc.

* S : Heat and corrosion resistant (stainless) steel

2. Property

– Corrosion and pitting resistance, tensile strength, corrosion resistance, creep strength, good heat resistance

Element	Impact
Cr, Ni, Mo	Provides corrosion resistance, tensile strength, corrosion and pitting resistance
N	Provides strength

[317 Chemical Composition (%)]

C	Mn	P	S	Si
Max. 0.08	Max. 2.00	Max. 0.045	Max. 0.030	Max. 0.75

Cr	Ni	Mo	N	Fe
18.0~20.0	11.0~15.0	3.0~4.0	Max. 0.10	Bal.

[317 Mechanical Properties]

Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)
Min. 515	Min. 205	Min. 35

[317 Physical Properties]

Density (g/㎤)	Melting Range (℃)	Specific Heat (0-100℃), J/kg*℃
7.89	1390~1440	502

3. Standard & Specification

– Specification : UNS S31700

4. Available Form

– Bar, Rod

– Coil, Strip

– Sheet, Plate

– Pipe, Tube

– Wire, Wire rod, Welding Wire

– Forgings

– Fittings, Flanges

5. Application & Product

– Petrochemical, Power generation, Marine, Medical, Construction

Application	Product
Petrochemical	Chemical and petrochemical processing equipment, ladders, cages, safety barriers, piping
Power generation	Power plant condensers
Marine	Fixtures, Fixtures, Structures, Ship ropes
Medical	Surgical instruments, Braces, Pins, Implants
Construction	Sculptures, Railings