Grade 1.4028 - 420 Stainless Steel
1.4028 is a martensitic grade of 420 stainless. It is a general purpose, free machining version of 420 stainless steel. Magnetic, hardenable with rust resistant properties. 1.4028 stainless is characterised by having a 0.26-0.35 carbon, and 12-14% chromium content. This mix of analysis gives 1.4028 an outstanding corrosion resistance and exceptional wear properties after heat treatment. Superior to 410 and 416 for most applications. 1.4028 has good ductility in the annealed condition, but is capable of achieving 51HRC after treatment. Optimal corrosion resistance is realised when 1.4028 is surface ground and polished after hardening.
| 1.4028 - 420 Stainless Steel Chemical Analysis wt % | ||||||
| C | Si | Mn | P | S | Cr | Ni |
| 0.26-0.35 | ≤ 1.50 | ≤ 1.00 | ≤ 0.04 | ≤ 0.03 | 12.0-14.0 | ≤ 1.00 |
Applications for 1.4028
Dental and surgical instruments cutlery pump shafts gear pinions, cams and various hand tools
Not recommended for high pressure vessels.
Soft Annealing 1.4028
Heat to 745-820°C. Cool slowly in air.
Structure is ferrite with spherical carbides.
Machineability of 1.4028
Good machining characteristics due to the addition of Sulphur.
High speeds and feeds producing short brittle chips
| 1.4028 - 420 Stainless Steel Mechanical Properties at ambient temperature | ||||||
|
Condition annealed. Quenched and tempered 850°C 0.2% Proof Stress: 650 Nmm² Tensile Strength: 850 - 1000 Nmm² Elongation: 10% Hardness HB Max 230 |
Forging 420S45
Hot forming temperature 800-1000°C. Slow cool
Hardening 420S45
Harden from a temperature 950-1050°C
Follow by oil or air quenching.
Hardness after quenching 45-51 HRC
Tempering 1.4028
Tempering temperature 625-724°C
Heat Treatment Advise of 1.4028
Treatment temperatures, including the rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each 420 stainless steel component. other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance for the heat treatment of 1.4028
Corrosion resistance 1.4028
Hardened condition realises resistance to atmosphere, fresh, dilute acids and alkalise, fresh water and fruit and vegetable juices
| 1.4028 - 420 Stainless Steel Physical properties | ||||||
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Average values at ambient temperature Modulus of elasticity. (10³ x N/mm) : 215 205 (200°C) 190 (400°C) Density. (g/cm³): 7.73 Thermal conductivity. (W/m.K): 30.0 Electric resistivity. (Ohm mm²/m): 0.65 Specific heat capacity. (J/g.K): 0.46 Magnetisable. Yes |
Welding of 1.4028
Not commonly welded due to its air hardening characteristics. Welding may possibly be performed after preheating to 150-205°C with the post welding tempering at temperature for 2 hours. Recommendation of specialist advice to be sought
Cold working of 1.4028
Material will withstand only minor cold work. Radical forming operations will result in cracking
Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustrations to enable the reader to make their own evaluations. They are not intended to either express or imply the suitability for these or any other purposes
