Is 420 stainless better than 316?

1. Differences in ingredients:
420 stainless steel is a martensitic stainless steel containing at least 12% chromium, has a higher carbon content and is designed to optimize strength and hardness properties.
316 stainless steel adds 2%-3% molybdenum element on the basis of 304 stainless steel, and also contains higher chromium and nickel components, which enhances its corrosion resistance.

2. Performance differences:
420 stainless steel has high hardness and wear resistance, but its corrosion resistance is relatively low. It may lose ductility especially at low temperatures, and overheating at high temperatures will reduce its strength. It is not usually welded because of its air hardening properties,
316 stainless steel is known for its excellent corrosion resistance and high temperature strength, especially in marine environments and acidic environments. It also has good plasticity, toughness, cold deformation and welding process properties.
3.Application fields:
420 stainless steel is often used where good corrosion resistance and excellent hardness are required, such as manufacturing knives, surgical instruments, shear blades, scissors, etc.
316 stainless steel is widely used in seawater equipment, chemical industry, dyes, papermaking, fertilizers, food industry, petrochemical industry and other fields, as well as transportation pipelines in high chlorine environments.

GNEE 420 stainless steel pipe inspection:
Composition analysis
Physical properties test
Mechanical properties test
Corrosion properties test
Non-destructive testing
Magnetic properties test