S. S. 430 / 430F / 430F SE

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UNS - S43000 / S43020 / S43023

Stainless steel grade 430 is non-hardenable steel, includes straight chromium, and has a place with the Ferritic group of steels. This 340 steel is best known for its good corrosion resistance and formability, coupled with practical mechanical properties. It can be utilized in certain chemical applications because of its resistance to nitric acid.

Grade 430F is normally provided in bar form to be utilized in automatic screw machines. This is a free machining version of 430. An essential Ferritic steel, non-heat treatable, 17% chromium stainless steels with moderate strength and corrosion resistance.

Grade 430F SE is a Ferritic stainless which replace selenium for sulfur to improve machinability. A basic non-heat treatable, 17% chromium stainless steels along with moderate strength and corrosion resistance.

Characteristics
For 430 grade:

• Good corrosion resistance
• Good oxidation resistance
• Thermal conductivity
• Good ductility
• Good formability

For 430F & 430F SE grade:

• free machining version of 430
• Non-heat treatable
• Moderate strength
• Corrosion resistance

Applications
For 430 grade:

• Automotive and architectural trim
• Vaults
• Heat exchangers
• Scientific apparatus
• Vending machine components

For 430F & 430F SE grade:

• Not to be used for containing high pressure gas or liquid due to its porosity.
• Successfully used in a variety of aircraft parts including fasteners, gears, shafts and pinions.

Machining
For 430 grade:

Machining rated at 60 % of B1112. Almost it can be easily machined in all common process.

For 430F & 430F SE grade:

Excellent chip breaks because of the addition of sulfur. Feeds and good speeds are possible with this alloy.

Welding
For 430 grades:
All common welding technique utilized for stainless will be successful with 430. Filler metal should be AWS E/ER308 or 312.

For 430F & 430F SE grade:
Not recommended for welding due to its high sulfur content. If welding is necessary, utilize low heat settings and filler metal of AWS E/ER430 for best results.

Forging
For 430 grades:
Bring the workpiece to 1500 F (816 C), then on rapidly to 1900 F (1038 C). Prolonged exposure at this temperature will cause grain growth. Do not work this material at less than 1500 F (816 C). Air cool to room temperature and anneal.

Hot Working
For 430 grade:
Generally the recommended technique of hot forming is to work the material within 1300 and 1500F. Hot forming is needed on heavy section.

For 430F & 430F SE grade:
A two step heating process is recommended starting with bringing the material to 1500 F (816 C), then slowly up to 1950-2100 F (1066-1149 C) before working. Do not work below 1500 F (816 C). Cool in air and anneal fully following cooling to room temperature.

Cold Working

For 430F & 430F SE grade:
This alloy will only withstand moderate cold forming.

Annealing

For 430 grade:
Soak at 1500 F, furnace cool (50 F/hour) to 1100 F, then air cool.

For 430F & 430F SE grade:
1250-1400 F (677--760 C), air cool.

Hardening

These alloy don´t respond to heat treatment.

Chemical Composition %


Mechanical Properties


Physical Properties


ASTM Specifications


Availability

For 430 grades:



For 430F & 430F SE grade: