429 Stainless Steel(UNS S42900)

Are you looking for an alloy with superior corrosion resistance, strength, and hardness? If so, then you should consider using stainless steel of type 429. With its low carbon content and added columbium, this metal offers excellent workability, formability, and resistance to oxidation at higher temperatures. Let’s take a closer look at this interesting alloy.

429 Stainless Steel Composition

Composed mainly of iron, chromium, and nickel, type AISI 429 stainless steel contains 11% chromium, 1% manganese, and .2% nitrogen. It also contains small amounts of silicon (.75%), phosphorus (.04%), and trace amounts of carbon, sulfur, and other elements. The addition of columbium gives this metal its superior properties in terms of strength and corrosion resistance.

Element Content (%)
Chromium, Cr 14-16
Silicon, Si 1
Manganese, Mn 1
Carbon, C 0.12
Phosphorous, P 0.04
Sulfur, S 0.03
Iron, Fe Balance

429 Stainless Steel Physical Properties

UNS S42900 is available in both cold-rolled (CR) and hot-rolled (HR) forms with a wide range of dimensions. Its tensile yield strength is 70 ksi, while its ultimate tensile strength is 75 ksi. AISI type-429 stainless steel has a Brinell hardness rating that ranges between 164 – 193 depending on the condition it’s in. Its thermal conductivity is 14 BTU/hr-ftF, while its electrical resistivity is 740 microhm-Cir-mil/ft at 68°F (20°C).

429 Stainless Steel Mechanical Properties

This alloy has an excellent combination of mechanical properties that make it ideal for various applications such as fasteners, shafts, pump components and more. It can be machined easily due to its low work hardening coefficient, which makes it easier to form compared to other metals like nickel alloys or titanium alloys. It can also be welded but requires special welding methods that ensure proper heat treatment after welding for maximum corrosion resistance characteristics.

Properties Metric Imperial
Tensile strength (annealed) 490 MPa 71068 psi
Yield strength (annealed/ @strain 0.200 %) 310 MPa 44961psi
Modulus of elasticity 200 GPa 29007 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break (In 2″, 50% cold worked) 30% 30%
Hardness, Rockwell B (annealed) 88 88

429 Stainless Steel Equivalents

  • ASTM A176
  • SAE 51429

429 Stainless Steel Uses

AISI 429 ss is a titanium-stabilized, ferritic chrome grade of stainless steel with excellent corrosion and oxidation resistance. Renowned for its strength at high temperatures and ease of fabrication, 429 stainless steel has a wide range of applications and is used in the automotive industry for exhaust systems, manifolds, and other components that need to endure extreme temperatures. Additionally, it can be used for food processing equipment like kitchen utensils or industrial equipment such as barrels and pumps due to its beneficial mechanical properties. Further uses include decorative pieces or electrical products, computer housings, or trim parts comprised of this versatile grade of stainless steel.


In conclusion, type-429 stainless steel has a wide range of uses, from automotive applications to food preparation equipment, due to its superior corrosion resistance capabilities combined with moderate mechanical properties such as strength and hardness. Thanks to its low carbon content combined with columbium additions during production, this metal offers excellent formability without sacrificing performance or durability under stress or high temperatures. If you’re looking for an economical yet strong alloy for your application needs, then consider using type-429 stainless steel!

ALLOYWORLD is suppier that specializes in metal, industrial and piping items. Additionally, we share the latest information and information about materials, products and various types of grades to assist businesses that are involved in this business.