Stainless Steel 429

Chemical Analysis
C Carbon
0.12max
Mn Manganese
1.00 max
P Phosphorus
0.040 max
S Sulfur
0.030 max
Si Silicon
1.00 max
Cr Chromium
14.00 – 16.00
Ni Nickel
0.75 max

General characteristics of Stainless Steel 429

Type 429 is a ferritic stainless steel with a slightly lower chromium content than that of type 430.

Applications of Stainless Steel 429

This alloy is suitable for applications involving fairly mild corrosive environments. The alloy may be used as forged parts when corrosive conditions warrant and where strength is not a factor, since the alloy cannot be hardened by heat treatment.

Forging Stainless Steel 429

Stock should be uniformly heated to 1500/1600ºF (815/870ºC) then heated to the forging temperature, 1900/2050ºF (1040/1120ºC) as quickly as possible. Parts should not be soaked beyond a very short time for fear of grain growth, and no forging should take place below 1500ºF (815ºC). Forged parts should be air cooled then annealed.

Heat treatment

Annealing

Parts should be heated uniformly to 1400/1500ºF (760/815ºC), soaked and air cooled. The hardness will be in the order of 155 BHN. Soaking in the temperature range 750/995ºF (400/525º,) particularly around 885/900ºF – or slowly cooling through the range – should be avoided to prevent what is known as 885 embrittlement. This embrittlement is thought to be due to precipitation of high-chromium ferrite.

Machinability

Type 429 stainless machines in a similar manner to SAE types 3140 and 4140. The use of carbide tooling allows increases in feeds and speeds.

Weldability

This alloy can be successfully welded by the shielded fusion and resistance welding methods. Oxyacetylene welding is not recommended since carbon pickup may occur. A type 430 filler metal could be used here, and a post-weld anneal is recommended.

 

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