20X23N18 (20Х23Н18) Stainless Steel – Heat-Resistant Austenitic Grade

Overview: What is 20X23N18?

20X23N18 is a heat-resistant austenitic stainless steel engineered for high-temperature service with strong oxidation and scaling resistance. With approximately 23% Cr and 18% Ni, it is widely used for furnace parts, heat-treat fixtures, exhaust systems, pyrolysis/chemical equipment, and power-generation components. At Russian Metals, we stock 20X23N18 in the following forms: sheets, plates, bars, tubes, and custom forgings. All materials are cut to size, mill-certified, and dispatched quickly across India and worldwide.

      

Grade :	20KH23N18 ( 20Х23Н18 ) ( Х23Н18 ЭИ417 )
Substitute:	20Х23Н13, 15Х25Т
Classification :	High alloy high-temperature steel

Chemical Composition (Typical, %)

Element

Element	C	Cr	Ni	Si	Mn	P (max)	S (max)
20X23N18	≤0.20	~22–24	~17–20	≤1.5–2.0	≤2.0	0.045	0.030

Notes:

Exact melt limits vary by mill/standard. Low-C variants improve weldability and reduce sensitization.

Chemical composition in % for grade 20KH23N18 ( 20Х23Н18 )

C	Si	Mn	Ni	S	P	Cr
max 0.2	max 1	max 2	17 - 20	max 0.02	max 0.035	22 - 25

Mechanical properties under Т=20oС for grade 20KH23N18 ( 20Х23Н18 )

Assortment	Dimension	Direct.	σB	σT	δ5	ψ	KCU	Heat treatment
-	(mm)	-	MPa	MPa	%	%	kJ/m²	-
Pipe	Ø 212 x 60	longitudinal	500	200	35	50		Guenching 1100 - 1150oC, air,
Bar, GOST 5949-75		longitudinal	490	196	35	50		Guenching 1100 - 1150oC, air,
Sheet trick, GOST 7350-77	Ø 25		540	265	35			Guenching 1030 - 1130oC,Cooling water,
Sheet thin, GOST 5582-75			510	245	35			Guenching 1080 - 1150oC,Cooling water,
Sheet thin, GOST 4986-79	to 600		570		19-38			Guenching 1050 - 1080oC,Cooling air,

Technological properties for grade 20KH13 ( 20Х13 )

Weldability :

limited weldability.

Physical properties for grade 20KH13 ( 20Х13 )

13.815.7

T	E 10- 5	α 10⁶	λ	ρ	C	R 10⁹
Grade	MPa	1/Grade	Watt/(m·Grade)	kg/m3	J/(kg·Grade)	Ohm·m
20	2.04		7900		1000
100		14.9	15.9		538
200
300	1.86	16.6	18.8
400	1.8	17.3		7760
500	1.73	17.5		7720
600	1.63	17.85	21.7	7670
700	1.53	17.85		7620
800	1.44	13
900				7540
T	E 10- 5	α 10⁶	λ	ρ	C	R 10⁹

Key Properties

High-temperature strength & stability

Excellent oxidation resistance up to ~1050–1100 °C (service-dependent)

Good corrosion resistance in many hot gases and mildly aggressive media

Austenitic structure → non-magnetic in annealed state, work-hardening on cold work

Good fabrication & weldability (use low-heat input, austenitic fillers; PWHT generally not required)

Equivalent steels for grade 08KH18N10T ( 08Х18Н10Т )

Warning! Indicated both exact and nearest equivalents.

Mechanical & Physical (Indicative)

Room-temp tensile strength: ≥515 MPa; yield: ≥205 MPa; elongation: ≥35–40%

Hardness: ~170–180 HB (annealed)

Density: ~7.9–7.95 g/cm³ | E-modulus: ~195 GPa

Thermal expansion (20–1000 °C): ~15.5–19 ×10⁻⁶/K

Electrical resistivity (20 °C): ~0.85–1.05 Ω·mm²/m

Types of delivery of grade 20KH23N18 ( 20Х23Н18 )

Equivalent / Related Grades

AISI 310/310S, EN 1.4841, X15CrNiSi25-21

CIS analogs used in market listings: 20X25H20C2 (20Х25Н20С2), 10X23N18 (10Х23Н18) (close relatives for sheet/plate supply)

Specification

Mechanical properties :

Available Products from Russian Metals

Sheets & Plates: hot-rolled (1D) and cold-rolled (2B); common sizes: 1000×2000, 1250×2500, 1500×3000/6000; thickness 0.4–100 mm (range by product route)

Bars & Rods: hot-rolled/peeled/ground; cut-to-length

Pipes & Tubes: welded/seamless (on request)

Forgings & Profiles: to drawing, with NDT (UT/MPI) & heat-treatment support

Certifications: MTC EN 10204 3.1, PMI, hardness, chemistry; ISO-aligned QA

Physical properties :

Why Russian Metals for 20X23N18

Large ready stock in India; fast global dispatch

Precision cutting, bending, machining & project kitting

Technical support on grade selection, weld procedures & high-temp design windows

Competitive pricing with strict QC and documentation

Weldability :