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420 2Cr13 S42020 Stainless Tool Steel Round Bar

Group Stainless Steel Bars
Min. Order 1 piece
Terms of Payment L/C, T/T
Update Time 2019-08-19
Item specifics
Delivery conditionannealed
Surface conditionBlack, Machined
Similar grades420 2Cr13 S42020
StandardASTM A276

Introduction

420 Stainless Tool Steel is a martensitic stainless steel with 12% Chromium which is sufficient to give good corrosive resistance properties. It’s best corrosive resistance is when hardened and surface is ground or polished.It has good ductility in the annealed condition but can be hardened up to 500HB (highest of the chromium grades). Martensitic Grades are known for high hardness and allowances must be made for poor weldability and usually allowances for a final harden and temper treatment. Steel is magnetic and welding is not recommended.

Applications

Moulds for corrosive plastic materials such as PVC, recycled polymers etc., moulds for chemically aggressive plastics and plastics containing abrasive fillers, mould inserts, dies and gauges for PVC extrusions, screws and barrels for extruders, moulds for automotive, food, medical and optical industry such as spectacles, compact discs, lenses.

Chemical Composition(%)

C

Si

Mn

P

S

Cr

Ni

Mo

0.15 min

1.0 max

1.0 max

0.040 max

0.030 max

12.0-14.0

0.75 max

0.50 max

Mechanical Properties (Q+T)

Tensile Strength (Mpa)

Yield Strength (Mpa)

Elongation (%)

Hardness (HB)

850-1000

600 min

12 min

280 min

HEAT TREATMENT

Annealing: For maximum softness, heat uniformly to 1500 – 1650°F (816 – 899°C) and cool slowly in the furnace.


Stress Relieving: Heat at 300 – 800°F (149 – 427°C) for 1 to 3 hours, cool in air or quench in oil or water.


Hardening: Preheat, then heat to 1800 -1950°F (982 – 1066°C), soak at temperature and air cool or quench in warm oil.


Welding: The martensitic class of stainless steels has limited weldability due to its hardenability. Special consideration is required to avoid cold cracking by preheating to 550°F (260°C). Post-weld heat treatment should be considered to achieve required properties. This particular alloy is generally considered to have poorer weldability than the most common alloy of this stainless class, Type 410. A major difference is higher carbon content for this alloy which requires both preheat and post-weld heat treatment. When a weld filler is needed, AWS E/ER 420, 410 NiMo and 309L are most often specified. Type 420 is well known in reference literature and more information can be obtained in this way.


Forming: If annealed for maximum softness, Type 420 can be moderately drawn and formed.