Great Steel & Metals offers superior quality Stainless Steel 420 sheet/ plates to its valuable customers across the world. When alloy 420 is exposed to welding or to high temperatures, cracking and hardening is prevented by the restricted carbon modification of 410.

General Properties

A non-hardening, low carbon modification of the general purpose 12% chromium martensitic stainless steel is Alloy 410 (UNS S41000). At high temperatures, the formation of austenite is minimized on account of a small alloy and low carbon addition and the ability of the alloy to harden is restricted by this. Even when alloy 420 is rapidly cooled from above the critical temperature, it remains ductile and soft. Therefore when the alloy is welded and exposed to high temperature, its non hardening prevents cracking. In the annealed condition, 420 is completely ferritic and good resistance to oxidation is exhibited by it along with adequate resistance to corrosion.

Applications

• Petroleum Refining and Petrochemical Processing
  • Columns
  • Distillation trays
  • Heat exchangers
  • Towers
• Ore Processing
  • Mining machinery
• Thermal Processing
  • Annealing boxes
  • Partitions
  • Quenching racks
• Gate valves
• Press plates

Standards

ASTM……..A 240
ASME……..SA 240

Corrosion Resistance

The corrosion resistance of Sandmeyer Steel 410S stainless steel is similar to type 410. It resists corrosion in atmospheric conditions, fresh water, mild organic and mineral acids, alkalis and some chemicals. It’s exposure to chlorides in everyday activities (e.g., food preparation, sports activities, etc.) is generally satisfactory when proper cleaning is performed after exposure to use.

General Corrosion Behavior Compared With Other Nonaustenitic Stainless Steels*

*Hardened martensitic grades were tested after tempering at 400°F (204°C)

As shown in the above table, 410S has good corrosion resistance to low concentratiions of mild organic and mineral acids.

Oxidation Resistance

The oxidation resistance of 410S stainless steel is good. It can be used in continuous service up to 1300°F (705°C). Scaling becomes excessive above 1500°F (811°C) in intermittent service.

Formability

410S stainless steel can be easily formed by spinning, bending and roll forming.

Chemical Analysis

The austenitic stainless steels are considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes.

*Alloy predominates remaining composition. Other elements may be present only in minimal quantities.

Physical Properties

Density
0.28 lbs/in3
7.73 g/cm3

Magnetic Permeability
0.28 lb/in3
7.73 g/cm3

Specific Heat
0.11 BTU/lb-°F (32 – 212°F)
0.46 J/kg-°K (0 – 100°C)

Modulus of Elasticity
29 x 106 psi
200 GPa

Thermal Conductivity 212°F (100°C)
187 BTU/hr/ft2/ft/°F
26.9 W/m-°K

Melting Range
2700 – 2790°F
1480 – 1530°C

Electrical Resistivity
23.7 Microhm-in at 68°C
60 Microhm-cm at 20°C

Linear Coefficient of Thermal Expansion

Mechanical Properties

Typical Room Temperature Mechanical Properties, Mill Annealed

Fabrication Data

Heat Treatment
The alloy can not be hardened by heat treatment. It is annealed in the 1600 – 1650°F (871 – 899°C) range and then air cooled to relieve cold working stresses. 410S should not be exposed to temperatures of 2000°F (1093°C) or above due to embrittlement. If excessive large grains are encountered after annealing mildly cold-worked material, the annealing temperature should be decreased to a range of 1200 – 1350°F (649 – 732°C) range.

Surface Preparation
For maximum corrosion resistance to chemical environments, it is essential that the 410S surface be free of all heat tint or oxide formed during annealing or hot working. All surfaces must be ground or polished to remove any traces of oxide and surface decarburization. The parts should then be immersed in a warm solution of 10-20% nitric acid followed by a water rinse to remove any residual iron.

Machining
Alloy 410S should be machined in the annealed condition using surface speeds of 60 to 80 feet (18.3 – 24.4 m) per minute.

Welding
For maximum corrosion resistance to chemical environments, it is essential that the 410S surface be free of all heat tint or oxide formed during annealing or hot working. All surfaces must be ground or polished to remove any traces of oxide and surface decarburization. The parts should then be410S is generally considered to be weldable by the common fusion and resistance techniques. Special consideration should be given to avoid brittle weld fractures during fabrication by minimizing discontinuities, maintaining low weld heat input and occasionally warming the part somewhat before forming. 410S is generally considered to have slightly poorer weldability than the most common ferritic stainless steel grade 409. A major difference can be attributed to the alloy addition to control hardening which results in the need for higher heat input to achieve penetration during arc welding. When a weld filler is required, AWS E/ER 309L or 430 filler material is most often specified.immersed in a warm solution of 10-20% nitric acid followed by a water rinse to remove any residual iron.