1.4541 (X6CrNiTi18-10) Stainless Steel: Equivalent Grades and Properties

What Is the Material X6CrNiTi18-10 (1.4541)?

X6CrNiTi18-10 is an austenitic stainless steel defined in the EN standard system with the material number 1.4541. It is the European counterpart of AISI 321: a chromium-nickel austenitic grade stabilized with titanium so that carbon is bound as stable titanium carbides rather than chromium carbides. This stabilization gives the steel excellent resistance to intergranular corrosion after welding and during service in the sensitization range of roughly 450-850 degrees C, making 1.4541 a standard choice for welded components, exhaust systems and heat exchangers.

Equivalent Grade Designations

Standard	Designation
EN (Europe)	X6CrNiTi18-10, number 1.4541
ASTM / AISI (USA)	321, UNS S32100
ISO	X6CrNiTi18-10 (4541-321-00-I)
GB (China)	06Cr18Ni11Ti (S32168)
JIS (Japan)	SUS321
BS (United Kingdom)	321S31

Chemical Composition (EN 10088-3)

Composition limits per EN 10088-2 and EN 10088-3 for X6CrNiTi18-10 (1.4541), in weight percent:

Element	Limit (%)
Carbon (C)	0.08 max
Silicon (Si)	1.00 max
Manganese (Mn)	2.00 max
Phosphorus (P)	0.045 max
Sulfur (S)	0.015 max
Chromium (Cr)	17.0-19.0
Nickel (Ni)	9.0-12.0
Titanium (Ti)	5 x C min, 0.70 max

Mechanical and Physical Properties

Typical mechanical properties of 1.4541 in the solution-annealed condition per EN 10088-3 (thickness up to 160 mm):

Property	Value
0.2% Yield Strength	215 MPa min
Tensile Strength	500-700 MPa
Elongation (longitudinal)	40% min
Impact Energy KV2 (longitudinal)	100 J min
Hardness	215 HB max

Physical properties: density 7.9 g/cm3, non-magnetic, electrical resistivity 0.73 micro-ohm-meter at 20 degrees C, specific heat capacity 500 J/(kg·K), thermal conductivity 15.0 W/(m·K) at 20 degrees C.

Heat Treatment

1.4541 is supplied in the solution-annealed condition: heating to 1020-1120 degrees C followed by rapid cooling (water or air). For demanding high-temperature service, an additional stabilization treatment at 870-900 degrees C with air cooling precipitates the titanium carbides completely. Because the steel is titanium stabilized, welded components do not require post-weld heat treatment, and the grade resists intergranular corrosion in both the delivery and sensitized conditions per EN 10088-3.

Corrosion Resistance and Applications

1.4541 offers good general corrosion resistance, excellent intergranular corrosion resistance after welding, and oxidation resistance up to about 900 degrees C. Typical applications include exhaust systems, heat exchanger tubes, furnace parts, chemical and food processing equipment, and welded structures that operate in the 450-850 degrees C range where unstabilized grades would sensitize. It is not suitable for seawater or high-chloride environments, where pitting and crevice corrosion occur.

1.4541 vs 1.4542

1.4541 (X6CrNiTi18-10) is a titanium-stabilized austenitic grade with good corrosion resistance but limited strength. 1.4542 (X5CrNiCuNb16-4) is a precipitation-hardening martensitic stainless steel, also known as 17-4 PH (UNS S17400), which develops very high strength through aging heat treatment and is used for pump shafts, valve parts and petrochemical components where strength is the governing requirement.

Frequently Asked Questions

What grade is 1.4541 equivalent to? 1.4541 (X6CrNiTi18-10) is equivalent to AISI 321 (UNS S32100), JIS SUS321, GB 06Cr18Ni11Ti (S32168) and BS 321S31.

Why is titanium added to 1.4541? Titanium combines with carbon to form stable titanium carbides, preventing chromium depletion at grain boundaries and protecting against intergranular corrosion after welding or service in the 450-850 degrees C range.

What is the heat treatment for 1.4541? Solution annealing at 1020-1120 degrees C with rapid cooling, plus optional stabilization at 870-900 degrees C for high-temperature service. No post-weld heat treatment is required.

What is the maximum service temperature of 1.4541? Oxidation resistance is good up to about 900 degrees C; above that, scaling accelerates. For pressure parts, allowable stresses above roughly 600 degrees C are governed by creep properties.

Is 1.4541 suitable for seawater? No. Like other molybdenum-free austenitics, it is prone to pitting and crevice corrosion in chloride-rich environments; molybdenum-bearing or duplex grades are required.

What is the difference between 1.4541 and 1.4301 (304)? 1.4541 adds titanium stabilization, which protects against intergranular corrosion after welding; 1.4301 (X5CrNi18-10, 304) has no stabilization and can sensitize in the 450-850 degrees C range, so 1.4541 is preferred for welded high-temperature service.