1. 439 Introduction

The 439 steel grade reduces the C content on the basis of ordinary ferrite materials (430), while adding stabilizing elements such as Ti to improve the intergranular corrosion resistance, formability and weldability of the steel grade. Compared with 304 steel, although its elongation is lower (about 30%), its strength and corrosion resistance are equivalent, and its corrosion resistance is better than that of 200 series materials.

Chemical Composition
CountryStandardGrade

Chemical Composition(%)

CSiMnPSCrNiN

Ti

Amercia

ASTM4390.031.001.000.040.0317.0-

19.0

0.5

0.04

0.2+4(C+N)-1.10
GernmanyDIN1.45100.051.000.000.040.01516.0-18.0

4(C+N)-0.80

2. Mechanical Properties

Standard

Mechanical behavior
TSYSElongationHardness
N/m㎡(≤)N/m㎡(≥)%

(≤)HV

ASTM

≥41520522180
DIN420-60023023

3. Main Purpose

Decorative panels for elevators and escalators

Architectural decorative panels, such as decorative structural parts, structural pipes

Component of automobile exhaust system

The inner drum of the washing machine”

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