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X2CrMnNiN17-7-5 (Manganese-Substituted Austenitic -- 201-Type)

X2CrMnNiN17-7-5 -- Mn-substituted low-nickel austenitic stainless (201-type). Comparable general corrosion resistance to 304 at lower and more stable raw material cost due to reduced Ni dependency. For cost-sensitive appliance trim, kitchen equipment and general fabrication where 304-level performance is desired at lower Ni exposure.

Stainless Steels Austenitic Stainless Steel (Low-Ni) ENX2CrMnNiN17-7-5 / 1.4372 (nearest) AISI/SAE201 ASTMA240 Type 201 UNSS20100 +2
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Description

X2CrMnNiN17-7-5 (201-type per EN 10088/ASTM A240 Type 201) uses Mn (5.5-7.5%) + N substitution to reduce Ni content to roughly 3.5-5.5% while maintaining a fully austenitic structure and good general corrosion resistance approaching 304 in most environments (though somewhat inferior in aggressive chloride exposure). The reduced, more price-stable Ni content gives more predictable material cost than 304, which is directly exposed to Ni market volatility. Standard for appliance trim, cookware, sinks, and general fabrication in cost-sensitive markets.

Key Properties — Solution Annealed
Rm (Tensile Strength)
515 – 750
MPa
Re / Rp0.2 (Yield)
275
MPa
A₅ (Elongation)
≥ 40.0
%
Hardness
— – 217
HB
E (Young's Modulus)
197
GPa
Density
7.80
g/cm³
Main Designations (6)
Standard BodyDesignationCountry / RegionNote
EN X2CrMnNiN17-7-5 / 1.4372 (nearest) EU
AISI/SAE 201 USA
ASTM A240 Type 201 USA
UNS S20100 USA (UNS)
JIS SUS201 Japan
JUS Nema JUS; Mn-supstituisani inox 201-tip Yugoslavia/BiH
Standards (6)
#Standard BodyDesignationCountry / RegionNote
1 EN X2CrMnNiN17-7-5 / 1.4372 (nearest) EU —
2 AISI/SAE 201 USA —
3 ASTM A240 Type 201 USA —
4 UNS S20100 USA (UNS) —
5 JIS SUS201 Japan —
6 JUS Nema JUS; Mn-supstituisani inox 201-tip Yugoslavia/BiH —
All values in wt.%
C
Carbon
≤ 0.1500
Cr
Chromium
16.0000 – 18.0000
Mn
Manganese
5.5000 – 7.5000
Ni
Nickel
3.5000 – 5.5000
N
Nitrogen
0.0500 – 0.2500
ElementSymbolMin %Max %Typical %
Carbon C — 0.1500 0.0800
Chromium Cr 16.0000 18.0000 17.0000
Manganese Mn 5.5000 7.5000 6.5000
Nickel Ni 3.5000 5.5000 4.5000
Nitrogen N 0.0500 0.2500 0.1500
Mechanical Properties
ConditionCode Rm min
MPa		Rm max
MPa		 Re min
MPa		Re max
MPa		 A₅ min
%		 Z
%		 KV
J		 HB minHB max HRC minHRC max E
GPa
Solution Annealed +AT 515 750 275 — 40.0 — — — 217 — — 197.0
Physical Properties
Density
7.800
g/cm³
Melting Point
1400–1450
°C
Young's Modulus
197.0
GPa
Poisson's Ratio
0.290
—
Thermal Conductivity
16.0
W/m·K
Thermal Expansion
17.00
×10⁻⁶ /K
Specific Heat
500
J/kg·K
Electrical Resistivity
0.7200
µΩ·m
Magnetic
No
 
Heat Treatment
Solution Annealing
Temperature:1010°C – 1120°C
Medium:Water quench
Duration:Sufficient
Cooling:Rapid
Hardness After:<=HB 217
Work hardening (pronounced)
Medium:201-type work-hardens more rapidly than 304 during cold forming due to lower stacking fault energy from Mn substitution
Duration:N/A
Cooling:N/A
Hardness After:N/A
Important consideration for deep-drawing die design -- may require more forming stages than 304.
Corrosion resistance caveat
Medium:Adequate for general atmospheric and mild chemical exposure; measurably inferior to 304 in aggressive chloride or acidic environments
Duration:N/A
Cooling:N/A
Hardness After:N/A
Not a drop-in substitute for 304 in marine or aggressive chemical service.
Magnetic response after cold work
Medium:Like 304, becomes slightly magnetic after heavy cold work due to partial martensite formation
Duration:N/A
Cooling:N/A
Hardness After:N/A
Machinability
Machinability Rating
relative to AISI B1112 = 100%
35.0%
Very Difficult
Turning Speed (HSS)
14
m/min
Turning Speed (Carbide)
72
m/min
Feed Rate (Turning)
0.090
mm/rev
Drilling Speed (HSS)
8
m/min
Milling Speed (Carbide)
74
m/min
CoolantHigh-pressure flood coolant recommended
Chip FormationLong stringy work-hardening chips; more pronounced work-hardening than 304
Tool MaterialTiAlN carbide; positive rake; moderate turning speed
Surface FinishRa 0.4-1.6 um
Moderately difficult -- more work-hardening tendency than 304 requires attention to cutting parameters.
Applications
Appliance Trim
Household appliance trim and decorative panels.
Cookware
Cost-sensitive cookware and kitchen equipment.
Sinks
Kitchen and utility sinks in cost-sensitive market segments.
General Fabrication
General sheet metal fabrication where full 304 corrosion performance is not required.
Technical Notes
✅
201 vs 304 -- when substitution is and is not appropriate
201-type: adequate for dry indoor use, decorative trim, and mild atmospheric exposure at lower and more stable cost. NOT appropriate for: food contact requiring maximum hygiene assurance in some jurisdictions, marine or coastal exposure, aggressive cleaning chemical exposure, or any application where 304-level corrosion resistance is a genuine engineering requirement rather than a cost consideration. Always verify local regulatory acceptance for food-contact applications specifically, as some markets restrict 200-series stainless for food equipment.