SUS420 Stainless Steel Plate Length Max 15m High Carbon High Hardness ASTM

Product Specification

SUS420J1 SUS420J2 stainless steel plate hot rolled and annealed width can be as client request

Grade 420 stainless steel is a higher carbon version of 410; like most carbon and low alloy steel it can be hardened by heat treatment. It contains a minimum of 12 per cent chromium, just sufficient to give corrosion resistant properties. 420 has good ductility in the annealed condition but is capable of being hardened up to Rockwell Hardness 50HRC, the highest hardness of the 12 per cent chromium grades. Its best corrosion resistance is achieved when hardened and surface ground or polished.
 

Corrosion Resistance
Grade 420 in the hardened condition has good resistance to the atmosphere, foods, fresh water and mild alkalies or acids. Corrosion resistance is lower in the annealed condition. Less corrosion resistant than the austenitic grades and also less than 17% chromium ferritic alloys such as Grade 430; 420 also has slightly lower resistance than grade 410. Performance is best with a smooth surface finish.
This grade is commonly used for cutlery - particularly blades of table knives and for some carving knives and similar. The corrosion resistance is sufficient to resist food and normal washing methods.Grade Data Sheet 420 Contact with unwashed food residues can result in pitting. Consult Haosteel Technical Assistance for specific environmental recommendations.
 

Heat Resistance
Not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties. The scaling temperature is approximately 650°C.
 

Heat Treatment 
Annealing Full anneal - 840-900°C, slow furnace cool to 600°C and then air cool.Process Anneal - 735-785°C and air cool.
Hardening Heat to 980-1035°C, followed by quenching in oil or air. Oil quenching is necessary for heavy sections. Temper at 150-370°C to obtain a wide variety of hardness values and mechanical properties as indicated in the accompanying table.The tempering range 425-600°C should be avoided.
 

Specified Properties
These properties are specified for bar product in ASTM A276. Bar is the most commonly available form of grade 420. Similar but not necessarily identical properties are specified for other products such as plate and forgings in their respective specifications.
 

Composition Specification (%)

Physical Properties (typical values in the annealed condition)

Grade Specification Comparison

Mechanical Properties - typical values

Welding
Pre-heat to 150-320°C and post-heat at 610- 760°C. Grade 420 coated welding rods are recommended for high strength joints, where a post-weld hardening and tempering heat treatment is to be carried out.If parts are to be used in the "as welded" condition, a ductile joint can be achieved by using Grade 309 filler rod. AS 1554.6 pre- qualifies welding of 420 with Grade 309 rods or electrodes.
 

Machining
In the annealed condition this grade is relatively easily machined, but if hardened to above 30HRC machining becomes more difficult. Free machining grade 416  is a very readily machined alternative.
Typical ApplicationsCutlery, knife blades, surgical instruments. Needle valves. Shear blades.
 

Export Packing:
1. Unit weight: 2-3tons per package or as client request.
2. Packing Type: strong wooden pallet and steel strip reinforcement, or as clients' request.