Stainless Steel Grade 420J2
Introduction
Stainless steel grade 420J2 is inexpensive and highly corrosion
resistant steel. It has good corrosion resistance in mild
atmosphere as well as domestic and industrial environments. It is
also resistant to dilute nitric acid, carbonic acid, ammonia, crude
oil, detergent solutions, vinegar, food acids, several petroleum
products, and steam.
Stainless steel grade 420J2 is known to possess good strength and
reasonable impact resistant properties in hardened and tempered
conditions when compared with 440 grades.
The following sections will discuss in detail about stainless steel
grade 420J2.
Chemical Composition
The chemical composition of stainless steel grade 420J2 is outlined
in the following table.
| Element | Content (%) |
|---|
| Chromium, Cr | 14 |
| Nickel, Ni (optional) | 1 |
| Manganese, Mn | 1 |
| Silicon, Si | 1 |
| Phosphorus, P | 0.04 |
| Carbon, C | 0.15-0.36 |
| Sulfur, S | 0.03 |
| Iron, Fe | Balance |
Other Designations
GB: 3Cr13 EN:1.4028 DIN: X30Cr13 JIS: 420J2 BS:420S45
Fabrication and Heat Treatment
Machinability
Stainless steel grade 420J2 is machinable both in hardened and
tempered conditions such as turning, drilling, and bending; however
it is recommended that machining in hardened condition should be
avoided as far as possible.
Welding
Welding of stainless steel grade 420J2 is easy. It is recommended
that welding in annealed or hardened and tempered conditions should
be avoided as it causes formation of brittleness, resulting in cold
cracking due to contraction stresses.
Pre-heating and inter-pass temperature control during welding,
followed by very slow cooling and post-weld annealing are good
measures to take to prevent cracking.
Annealing
Annealing of this material can be performed by heating uniformly to
840-900°C (1544-1652°F) and held until the temperature is uniform
throughout the section. Soaking and cooling is required.
Heat Treatment
Stainless steel grade 420J2 has to be heated uniformly to 730-790°C
(1346-1454°F) and held until temperature is uniform throughout the
section.
Hardening
Stainless steel grade 420J2 can be hardened by heating 950-1020°C
(1742-1868°F) and held until temperature is uniform throughout the
section. This should be followed by quenching in oil or air
cooling. Tempering should be done when it is slightly warm.
Applications
Stainless steel grade 420J2 is used in the following application
areas:
- Surgical instruments
- Daggers and swords
- Budget knives and diving knives
- Haircutting scissors and domestic scissors
Packing:
1.with wooden pallets, or film covered, in the containers.
2.Export standard package or as the customers' demands.
3.seaworthy wooden cases,
4.with or without edge protector,steel hoop and seals,
5.export -ted standard package or as customers signal requirement
Maintenance:
(1) Regular cleaning and maintenance
(2) Pay attention to prevent the occurrence of the phenomenon of
surface scratches
(3) Use soap, weak detergent or warm water to remove surface dust,
dirt
(4) In addition to the surface of the binder with alcohol or an
organic solvent
(5) Use neutral detergent or ammonia solution in addition to
surface oil
(6) With 10% nitric acid or abrasive detergent in addition to the
surface of the embroider caused by the dirt.
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