420 Stainless Steel Manufacturers and Suppliers

IQS Directory provides a comprehensive list of 420 stainless steel manufacturers and suppliers. Use our website to review and source top 420 stainless steel manufacturers with roll over ads and detailed product descriptions. Find 420 stainless steel companies that can design, engineer, and manufacture 420 stainless steel products to your company’s specifications. Then contact the 420 stainless steel companies through our quick and easy request for quote form. Website links, company profile, locations, phone, product videos and product information is provided for each company. Access customer reviews and keep up to date with product news articles. Whether you are looking for manufacturers of stainless steel foil, stainless steel coils, stainless steel strips, or customized 420 stainless steel products of every type, this is the resource for you.

Related Categories

More 420 Stainless Steel Companies Click
Industry Information

420 Stainless Steel

The term “stainless steel 420” refers to a small group of the steel alloys with similar chemical compositions, grouped together based on the judgement of SAE International, or the Society of Automotive Engineers. Grade 420 stainless steels are high carbon steels with, at minimum, a 12% chromium content. As such, after heat treatment, they achieve high levels of hardness, strength and wear resistance. In fact, at 50 HRC, grade 420 stainless steels achieve the highest hardness level of all 12% chromium stainless steels. Grade 420 stainless steels are commonly used steels, and they are frequently fabricated into items like: knife blades, cutlery, needle valves, shear blades, and surgical equipment and instruments.

To provide the best services and exhibit the highest possible levels of hardness, any stainless steel 420 product should undergo heat treatment. Stainless steel 420 heat treatment usually begins with annealing and continues with hardening. Annealing is a process that involves heating the steel to between 840°C and 900°C, and then allowing it to cool slowly in a furnace to around 600°C and, finally, allowing the metal to air-cool. During this state, the stainless steel has excellent ductility and can be manipulated into many shapes. During hardening, stainless steel 420 is heated to temperatures between 980°C and 1035°C, immediately followed by air or oil quenching, both which are rapid cooling processes. Either quenching method may be chosen, but, for heavy metal sections, oil quenching is more effective. After quenching, to attain good mechanical properties and increased hardness, workers temper the steel, or bring it below its lower critical temperature. In this case, they lower the steel’s temperature to between 150°C and 350°C. Other procedures commonly performed on stainless steel 420 include welding and machining. The welding process is an ideal choice for those wishing to form strong joints. Note that the metal is easily machined while annealed, but presents far more difficulties when it reaches a hardness above 30 HRC.

Once stainless steel 420 has undergone heat treatment, it exhibits good resistance to corrosion from mild acids, alkalis, fresh water, air and food, lending it well to the applications mentioned above. To maintain the health and positive properties of a stainless steel 420 product, users must follow certain maintenance and care guidelines. If they do not, their product may succumb to discoloration, rust or the influence of strongly corrosive substances. This is especially true in environments more prone to the creation of stressing environments, such as indoor swimming pools or custodial services that use harsh chemicals. In a workshop environment, to avoid contamination by carbon steel, or free iron, which frequently leads to accelerated and localized corrosion, take care to clean tools between processes. Common spots where contamination occurs include: on steel storage racks, with tools used with other metals, on finishing belts, on grinding wheels, from wire brushes, from grinding or welding sparks, and from being adjacent to carbon steel fabrication. Keep stainless steel 420 clean by washing it with warm water and soap or a mild detergent, then rinsing it with cold water. To enhance the surface, wipe it dry. With a little care and cleaning, stainless steel 420 parts and products can last many years; they’re well worth the investment.


Stainless Steel Sheets Stainless Steel Strips
Stainless Steel Sheets - CADA Stainless & Alloys Stainless Steel Strips - CADA Stainless & Alloys


420 Stainless Steel Properties

Compositional Ranges of Grade 420 Stainless Steel
Carbon (C) Manganese (Mn) Silicon (Si) Sulfur (S) Phosphorus (P) Chromium (Cr)
Min. 0.15 - - - - 12.0
Max. - 1 1 0.040 0.03 14.0


Mechanical Properties of Grade 420 Stainless Steel
Tempering Temperature (°C) Tensile Strength (MPa) Yield Strength 0.2% Proof (MPa) Elongation (% in 50mm) Hardness Brinell (HB) Impact Charpy V (J)
Annealed* 655 345 25 241 max -
204 1600 1360 12 444 20
316 1580 1365 14 444 19
427 1620 1420 10 461 #
538 1305 1095 15 375 #
593 1035 810 18 302 22
650 895 680 20 262 42
* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum
# Tempering of this steel should be avoided in the range 425-600°C


Physical Properties of Annealed Grade 420 Stainless Steels
Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (µm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (nO.m)
0 - 100°C 0 - 315°C 0 - 538°C at 100°C at 500°C
7800 200 10.3 10.8 11.7 24.9 - 460 550


Move to Top