UNS S30400 stainless steel

Alloy 304/304H (UNS S30400/S30409) is a modification of the most widely used “18-8” chromium-nickel austenitic stainless steel. Carbon content is controlled in the range of 0.04-0.10% to increase strength at temperatures above 800°F (427°C). It is an economical and versatile corrosion-resistant alloy suitable for a wide range of general-purpose applications.

It is common practice for a 304H to be dual certified as 304 and 304H. The high carbon chemistry of 304H enables 304 to meet the mechanical property and grain size requirements of 304H.

Alloy 304/304H has similar general corrosion resistance to 304/304L. It resists atmospheric corrosion, as well as moderate oxidizing and reducing environments. However, due to its high carbon content, Alloy 304/304H is prone to carbide precipitation in the heat-affected zone of the weld.

Alloy 304/304H is nonmagnetic in the annealed state but becomes slightly magnetic when cold worked or welded. It can be easily welded and machined through standard shop fabrication practices.

UNS S30400 stainless steel Chemical Composition

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
304	min.	-	-	-	-	-	18.0	-	8.0	-
304	max.	0.08	2.0	0.75	0.045	0.030	20.0	-	10.5	0.10
304L	min.	-	-	-	-	-	18.0	-	8.0	-
304L	max.	0.03	2.0	0.75	0.045	0.030	20.0	-	12.0	0.10
304H	min.	0.04	-	-	0.045	-	18.0	-	8.0	-
304H	max.	0.10	2.0	0.75	0.045	0.030	20.0	-	10.5	-

UNS S30400 stainless steel Equivalent Grades

AISI 304 equivalent grade

European

Germany

Britain (UK)

ISO

Japan

China

Standard

Grade (UNS)

Standard

Steel Name (Steel Number)

Standard

Grade (Steel Number)

Standard

Grade (Steel Number)

Standard

Grade

Standard

Grade

Standard

Grade

AISI SAE;
ASTM A240/A240M;
A276/A276M

AISI 304
(UNS S30400)

EN 10088-2;
EN 10088-3

X5CrNi18-10 (1.4301)

DIN EN 10088-2;
DIN 17440

X5CrNi18-10 (1.4301)

DIN EN 10088-2;
BS970 :1996

X5CrNi18-10 (1.4301);
304S15

ISO 15510

X5CrNi18-10

JIS G4304

SUS304

GB/T 1220;
GB/T 3280

06Cr19Ni10;
0Cr18Ni9 (Old designation)

UNS S30400 stainless steel Surface

Surface Finish	Defination	Application
2B	Those finished, after cold rolling, by heat treatment, pickling or other equivalent treatment and lastly by cold rolling to given appropriate luster.	Medical equipment, Food industry.Construction material, Kitchen utensils.
BA	Those processed with bright heat treatment after cold rolling.	Kitchen utensils, Electric equipment, Building construction.
NO.1	The surface finished by heat treatment and pickling or processes corresponding there to after hot rolling.	Chemical tank, pipe.
HL	Those finished polishing so as to give continuous polishing streaks by using abrasive of suitable grain size.	Building construction.
8K	The product have excellent brightness and prefect reflexivity can be the mirror.	Mirror.

UNS S30400 stainless steel forms

Tube, flange, sheet, plate round bar, fasteners.

Nuts
Bars
Bolts
Pipes
Screw
Tubing
Valves
Washers
Flanges
Fasteners
Electrodes
Stud Bolts
Sheet Plates
Pipe Fittings

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Table of contents

UNS S30400 stainless steel Chemical Composition

UNS S30400 stainless steel Equivalent Grades

UNS S30400 stainless steel Surface

UNS S30400 stainless steel forms

FAQ