Shandong Kuaima  Steel Co., Ltd.



420 stainless steel coil


Product introduction


Product characteristics

Alloy 420 is a hardenable, martensitic stainless steel that is a modification of Alloy 410. Similar to 410, it contains a minimum of 12% chromium, just sufficient enough to give corrosion resistant properties. Alloy 420 has higher carbon content than Alloy 410 which is designed to optimize strength and hardness characteristics. It has good ductility it the annealed condition but is capable of being hardened up to Rockwell hardness 50 HRC, the highest hardness of the 12% chromium grades. Due to its hardening properties, Alloy 420 is not often welded, although it is possible. Martensitic stainless steels are designed for high hardness and sometimes other properties are to some degree compromised. Corrosion resistance is lower than the common austenitic grades and their useful operating range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished.


Alloy 420 is used for a variety of applications where good corrosion and outstanding hardness is necessary. It is not usually used at temperatures exceeding 800oF (427oC) due to quick hardening and loss of corrosion resistance. Examples of applications that use alloy 420 include:

· Cuttery

· Knife blades

· Surgical instruments

· Needle valves

· Shear blades

· Scissors

· Hand tools


· Less resistant than the austenitic grades and the 17% chromium ferritic alloys

· Good resistance in the hardened condition to the atmosphere, foods, fresh water, and mild acids

· Resistance lowered in the annealed condition

· Best with a smooth surface finish


· Not recommended for use above the relevant tempering temperature because of reduction in mechanical properties

· Scaling temperature is approximately 1202oF (650oC)


· Not commonly welded due to air hardening characteristics.

· Welding may be performed after preheating to 300-400 F

· Post weld tempering at temperature for 2 hours


· Recommended to bring temperatures slowly up to 1400, then on to 2000-2200 F

· Furnace cool slowly to avoid cracking, after furnace working

· Reheating is necessary to keep working temperature above 1600 F.


· Can withstand only minor cold work.

· Radical forming operations will result in cracking.


· Anneal at temperatures between 1550-1650 F (843-900 C)

· Allow for slow furnace cooling.


· Temper at temperatures of 300-400 F

· Air cool for maximum hardness and corrosion resistance.


· Soak at 1850-1950 F to quench in heated oil.

Place of Origin shandong, China
Brand Name kuaima
Application Building or structual steel
Type Steel Coil, Austenitic,Martenstic, Ferritic, Duplex,, stainless steel Steel Sheet
Standard AiSi, ASTM, bs, DIN, GB, JIS
Width 600mm-1250mm, 600mm-1500mm as required
Length Customers' Requirement, 1-12M as required
Grade 201,304,316 stainless steel, 200 series, 300 series, 400 series 904,duplex2205/2507
Surface Treatment Coated
Tolerance ±1%
Processing Service Bending, Welding, Decoiling, Cutting, Punching
Keyword Ss coil
Thickness 0.25-3mm as required
Surface No.1,No.4, BA, 2B, 8K, HL etc.
Use Metal Roofing Building Steel Material
Delivery time 15 Days
MOQ 1 Ton
Technique Cold Rolled
Special Use High-strength Steel Plate
Model Number 304 316 304L 316L etc.
Packaging Details Tied up with steel strips and wrapped with water proof paper<br><br>thick plates are packed separately, thin plate are packed in bundles
Port Tianjin Port/Shanghai Port

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  • Address:Liaocheng Economic and Technological Development Zone, Shandong Province, China

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