316(Cr-Ni-Mo)

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1. Introduce

– 316 stainless steel is formulated to have improved corrosion resistance over 300 series and lower stainless steels

– Increased corrosion resistance and high temperature strength over grade 304 by adding approximately 2-3% Mo

– UNS S31600

* 316 vs 304

: Both 304 and 316 contain Cr, an element that improves corrosion resistance

Characteristics	316	304
Alloying elements (Mo)	Added(Approx. 2~3%Mo) → Better corrosion resistance than 304 due to Mo addition	Not Added
PREN value	23~28 → Mo : Role in improving PREN value 3.3 times compared to Cr	18~20

* PREN (Pitting Resistance Equivalent Number: Formula resistance index)
: Numerical value of resistance to pitting in chloride environment of stainless steel
: Pitting resistance is determined by the chemical elemental composition of stainless steel
→ Cr, Mo, N

* 316 Stainless steel type : Related to carbon content

: 316 series is a material with improved resistance to acid and localized corrosion from chloride environment by adding about 2-3% Mo

: Carbon content: Higher carbon content improves thermal stability and creep strength, lower carbon content improves weldability

– 316L : Carbon content 0.030% Maximum

– 316 : Carbon content 0.08% Maximum

– 316H : Carbon content 0.04~0.10% Maximum

* 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

– Excellent high temperature strength, strength, corrosion resistance, abrasion resistance

Element	Impact
Cr, Ni	Provides corrosion resistance
Mo	Provides corrosion resistance, high temperature strength

[316 Chemical Composition (%)]

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

Si	Cr	Ni	Mo
Max. 1.00	16.0~18.0	10.0~14.0	2.0~3.0

[316 Mechanical Properties]

Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)
Min. 520	Min. 205	Min. 40

[316 Physical Properties]

Density (g/㎤)	Melting Range (℃)	Specific Heat (0-100℃), J/kg*℃
7.87	1375~1400	500

3. Standard & Specification

– Specificaiton : UNS S31600

ASTM	A240, A666
ASME	SA240
AMS	5524

4. Available Form

– Bar, Rod

– Sheet, Plate, Strip

– Wire, Coil

– Tube

5. Application & Product

– Chemical, Marine, Medical

Application	Product
Chemical	Heat exchangers, Pressure vessels, Chemical vessels, Valves and pumps
Marine	Boat accessories, Ship hardware, Offshore structures
Medical	Surgical instruments, Implants