SS 420 is a martensitic and hardness stainless steel that is avariation of alloy 410.Even though that it is imaginable due to itscongealed properties, it is not welded regularly. SS 420 Coils are generally used in the industry of car manufacturing to supply the strength and durability essential to get through testing in a crash. Due to its corrosion resistance properties and low maintenance, many industries like chemical and petrochemical plants, the pharmaceutical industry and chemical tankers also preferred SS 420 Steel.
SS 420 Coils Equivalent Grades
| Grade | UNS | JIS | WERKSTOFF NR. | AFNOR | BS | GOST | EN |
| SS 420 | S42000 | SUS 420 | 1.4021 | - | - | - | - |
Due to its hardenability, the martensitic class of coils has limited weldability. Special consideration is required to prevent cold cracking by preheating up to 550 deg f. The post weld heat treatment should consider attaining desired properties. The major difference is its carbon content which requires post weld heat treatment and preheats treatments. It is recommended for the softness and heated uniformly up to 1500 deg f to 1650 deg f. After hardening it is rapidly cooled and soaks at temperatures. The stress relieving operation is also performed.
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