420 1.4021 X20Cr13 Stainless Steel

 

Key Characteristics

Type: Martensitic Stainless Steel.

Hardenability: Can achieve high hardness (up to ~50 HRC) through heat treatment (quenching & tempering).

Corrosion Resistance: Moderate, improved by polishing/grinding; not for chlorides or marine use.

Magnetic: Yes, in the hardened and tempered condition.

Weldability: Generally weldable with appropriate consumables.

Typical Applications

Cutlery & Blades: Knives, surgical instruments, decorative items.

Machinery: Valve seats, pump components, shafts, piston rods, stirrers, fasteners (bolts, nuts).

Industrial: Automotive, petrochemical, food/beverage, hydraulics, energy sectors.

Designation Equivalents

AISI: 420 (S42000)

EN: 1.4021 (X20Cr13)

BS: 420S29, 420S37

AFNOR: Z20C13

 

Chemical component

C	Si	Mn	P	S	Ni	Cr	Cu
0.16 to 0.24	Max 0.60	Max 0.60	Max 0.030	Max 0.020	Max 0.60	12.00 to 14.00	Max 0.30