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Ferritic Stainless Steel


     

Alloy 410S
Restricted Carbon Modification of 410 that Prevents Hardening and Cracking when Exposed to High Temperatures or Welding

 


Specs: Alloy 410S
(UNS S41008) W. Nr. 1.4000

General Properties
Applications

Standards
Chemical Analysis
Physical Properties
Mechanical Properties
Corrosion Resistance
Oxidation Resistance
Formability
Heat Treatment
Machining
Surface Preparation
Welding

 



General Properties
Alloy 410S (UNS S41008) is a low carbon, non–hardening modification of Alloy 410 (UNS S41000) the general purpose 12% chromium martensitic stainless steel. The low carbon and a small alloy addition minimize austenite formation at high temperatures which restricts the alloys ability to harden. 410S remains soft and ductile even when rapidly cooled from above the critical temperature. This non-hardening characteristic helps prevent cracking when the alloy is exposed to high temperatures or welded. 410S is completely ferritic in the annealed condition. It exhibits adequate corrosion resistance similar to 410 and good oxidation resistance.

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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

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Standards
ASTM...............A 240
ASME............... SA 240

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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. The Alloys 304 and 304L are typical of the

Cr Ni C Mn
11.5 min. - 14.5 max. 0.60 max. 0.08 max. 1.00 max.
P S Si Fe
0.040 max. 0.030 max. 1.00 max. Balance*

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

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Physical Properties
Density
0.28 lb/in3
7.73 g/cm3

Magnetic Permeability
0.28 lb/in3
7.73 g/cm3

Modulus of Elasticity
29 x 106 psi
200 GPa

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

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

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

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

Linear Coefficient of Thermal Expansion

  In/in°F um/m-°K
32 – 212°F (0 – 100°C) 6.0 x 10-6 10.8
32 – 600°F (0 – 315°C) 6.4 x 10-6 11.5
32 – 1000°F (0 – 538°C) 6.7 x 10-6 12.2
32 – 1200°F (0 – 649°C) 7.5 x 10-6 13.5

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Mechanical Properties
Typical Room Temperature Mechanical Properties, Mill Annealed

0.2 % offset Yield Strength Ultimate Tensile Strength Elongation percent in 2"
(50mm)
Reduction percent of area Hardness Rockwell B
psi (MPa) psi (MPa)
42,000 (290) 64,400 (444) 33 65 75

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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*

5% Test
Solution at 120°F (49°C)
Corrosion Rate in Mils per Year and Millimeters per Year (mm/a)
Alloy 409 Alloy 410S Alloy 420 Alloy 425 Mod Alloy 440A Alloy 430
Acetic Acid 0.88
(0.022)
0.079
(0.002)
1.11
(0.028)
4.79
(0.122)
2.31
(0.0586)
0.025
(0.0006)
Phosphoric Acid 0.059
(0.002)
0.062
(0.002)
0.068
(0.002)
0.593
(0.015)
0.350
(0.009)
0.029
(0.001)

*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.

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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.

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

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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.

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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.

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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.

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Welding
410S 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.

NOTE
This technical data and information represents our best knowledge at the time of printing. However, it may be subject to some slight variations due to our ongoing research program on corrosion resistant grades.

We, therefore, suggest that information be verified at time of inquiry or order. Furthermore, in service, real conditions are specific for each application. The data presented here is only for the purpose of description and may only be considered as guarantees when our Company has given written formal approval.

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