COMMON TRADE NAMES: Sanicro® 28, SAF® 28, Nic28, NiCro 31/27

Alloy 28 is a highly alloyed austenitic stainless steel intended for highly corrosive environments. It is resistant to strong acids, pitting corrosion, crevice corrosion, and stress corrosion cracking. Alloy 28 is commonly referred to by the tradename Sanicro® 28, 28 Chrome, and the universal designation of UNS N08028.

 

Standard	Grade
	Chemical composition %
	C:	Si:	Mn:	P:	S:	Cr:	Mo:	Ni:	Cu:	N:
EN	1.4563 - X1NiCrMoCu31-27-4
	<0.02	<0.7	<2.0	<0.03	<0.01	26.0 - 28.0	3.0 - 4.0	30.0 - 32.0	0.7 - 1.5	<0.1
ISO	Alloy 28 - UNS N08028
	<0.03	<1.0	<2.5	<0.03	<0.03	26.0 - 28.0	3.0 - 4.0	30.0 - 34.0	0.6 - 1.4	-
GOST	02Ch27N31M4 - 02Х27Н31М4
	<0.03	<1.0	<2.5	<0.03	<0.03	26.0 - 28.0	3.0 - 4.0	29.5 - 32.5	0.6 - 1.4	-
NF	Z2NCDU31-27
	<0.02	<0.5	<2.0	<0.025	<0.01	26.0 - 28.0	3.0 - 4.0	30.0 - 32.0	0.7 - 1.5	-

Physical and mechanical properties

1.4563 - general physical and mechanical properties:

In ambient temperature: 

Density: 8 g/cm3

Specific heat capacity: 0.45 kJ/(kg*K)

Thermal conductivity: 12 W/(m*K)

Young's modulus E: 195 GPa

Electrical resistivity: 1 µΩ*m

Linear expansion coefficient: 15.8 (10-6/K)

 

Testing temperature: 100°C: 

Lin. exp. coeff.: 15.8 (10-6/K)

Young's modulus E: 190 GPa

Testing temperature: 200°C: 

Lin. exp. coeff.: 16.1 (10-6/K)

Young's modulus E: 182 GPa

 

Testing temperature: 300°C: 

Lin. exp. coeff.: 16.5 (10-6/K)

Young's modulus E: 174 GPa

Testing temperature: 400°C: 

Lin. exp. coeff.: 16.9 (10-6/K)

 Young's modulus E: 166 GPa

 

Testing temperature: 500°C: 

Lin. exp. coeff.: 17.3 (10-6/K)

Young's modulus E: 158 GPa

 

1.4563 alloy's mechanical properties in hot rolled and solution annealed condition (+AT):

Forgings: 

General parameters: 

Yield strength Re: > 220 MPa

Tensile strength Rm: 500-700 MPa

Elongation A: > 40 %

Hardness HB: < 230

 

Longitudial test pieces: 

Impact energy KV. 20°С: > 100 J

 

Transverse test pieces: 

Impact energy KV. 20°С: > 60 J

Impact energy KV. -196°С: > 60 J

 

High temperature test: 

Testing temperature: 50°C: 

Re: > 209 MPa

Rm: > 485 MPa

 

Testing temperature: 100°C: 

Re: > 190 MPa

Rm: > 460 MPa

 

Testing temperature: 150°C: 

Re: > 175 MPa

Rm: > 445 MPa

 

Testing temperature: 200°C: 

Re: > 160 MPa

Rm: > 430 MPa

 

Testing temperature: 250°C: 

Re: > 155 MPa

Rm: > 410 MPa

 

Testing temperature: 300°C: 

Re: > 150 MPa

 Rm: > 400 MPa

 

Testing temperature: 350°C: 

Re: > 145 MPa

Rm: > 395 MPa

 

Testing temperature: 400°C: 

Re: > 135 MPa

Testing temperature: 450°C: 

Re: > 125 MPa

 

Testing temperature: 500°C: 

Re: > 120 MPa

 

Testing temperature: 550°C: 

Re: > 115 MPa

 

Mechanical properties of 1.4563 wires:

Delivery condition +2D: 

Diameter D: 0.05 - 0.10 mm 

Rm: < 1100 MPa

A: > 20 %

 

Diameter D: 0.1 - 0.2 mm 

Rm: < 1050 MPa

A: > 20 %

 

Diameter D: 0.2 - 0.5 mm 

Rm: < 1000 MPa

A: > 30 %

 

Diameter D: 0.5 - 1.0 mm 

Rm: < 950 MPa

A: > 30 %

 

Diameter D: 1 - 3 mm 

Rm: < 900 MPa

A: > 30 %

 

Diameter D: 3 - 5 mm 

Rm: < 850 MPa

A: > 35 %

 

Diameter D: > 5 mm 

Rm: < 800 MPa

A: > 35 %

 

In strain hardened delivery condition +2H, with diameter > 0.05mm: 

cond. +C500 - Rm: 500-700 MPa

cond. +C600 - Rm: 600-800 MPa

cond. +C700 - Rm: 700-900 MPa

cond. +C800 - Rm: 800-1000 MPa

cond. +C900 - Rm: 900-1100 MPa

cond. +C1000 - Rm: 1000-1250 MPa

cond. +C1100 - Rm: 1100-1350 MPa

cond. +C1200 - Rm: 1200-1450 MPa

cond. +C1400 - Rm: 1400-1700 MPa

cond. +C1600 - Rm: 1600-1900 MPa

cond. +C1800 - Rm: 1800-2100 MPa

 

Heat treatment and working

Recommended working and heat treatment parameters for X1NiCrMoCu31-27-4 alloy:

Forging: 1150-850 °C

Rolling: 1150-850 °C

Solutioning: 1050-1150 °C

 

We deliver this steel alloy as:

Rods

Sheets

Strips

Pipes