302HQ stainless steel properties

Looking at 302HQ stainless steel properties is the compostion of which contents and why does it common for making self-tapping screws and light machine screws

Properties of 302HQ stainless steel.

The carbon content is slightly higher than that of 304 stainless steel, and does not respond to heat treatment. Grade 302 is very ductile and may be ready to be drawn, spun or upset. The hardness of Grade 302 is dramatically increased through cold working, which will also cause it to be magnetic

Chemical contents 302HQ SS
Fe

C
<0.15 %
Cr
17 - 19 %
Ni
8 - 11 %
Cu
3 - 4 %
Mn
< 2 %
Si
< 1 %
P
< 0.045 %
Si
< 0.03 %
N



Comparision chemical content 302HQ stainless steel with 301 stainless steel.

As you see in the table of chemical content, the different of 302HQ stainless steel and 301 is the element of Cr, Ni and Cu in steel alloy. With a small different content of element, the coposition can be changed with another characteristic. 

Chemical contents

302HQ SS
301 SS
Fe


C
<0.15 %
<0.15 %
Cr
17 - 19 %
16 - 18 %
Ni
8 - 11 %
6 - 8 %
Cu
3 - 4 %

Mn
< 2 %
< 2 %
Si
< 1 %
< 1 %
P
< 0.045 %
< 0.045 %
Si
< 0.03 %
< 0.03 %
N



The inclusion of 3% copper in the composition reduces the cold work hardening rate substantially compared to Grade 304. This grade is the standard material for manufacture of self-tapping screws and light machine screws and is also used for some bolts, set screws, rivets and specialised fasteners. (Ref from www.azom.com) Now, are you understand the reason why this grade of stainless steel 302HQ is common using in making self-tapping screws and light machine screws.


302HQ Stainless steel application

302 HQ stainless steel screw

Flat head 302 stainless steel self drilling screw


SUS302HQ head nut