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Material

Fabrication of 310S 310H Stainless Steel




Alloys 309/309S and 310/310S stainless steel are widely used in the heat treatment/process industries due to high temperature properties and corrosion resistance. As such, they are commonly fabricated into complex structures. Mild carbon steel is generally treated as the standard for performance in most metal forming operations.

With respect to carbon steel, the austenitic stainless steel exhibit a significant difference – they are tougher and tend to work harden rapidly. While this does not alter the general methods used for cutting, machining, forming, etc., it does affect the specifics of those methods.

Cutting and machining the austenitic stainless steel is readily accomplished using standard techniques typically employed for common mild steel, with some modifications. Their cutting behavior can be quite different – they are tougher and tend to harden rapidly during working. The chips produced are stringy and tough and retain considerable ductility.

Tooling should be kept sharp and be rigidly held. Deeper cuts and slower speeds are generally used to cut below work hardened zones. Due to the low thermal conductivity and high coefficient of thermal expansion inherent to the austenitic stainless steel, heat removal and dimensional tolerances must be considered during cutting and machining operations.

The austenitic stainless steel are readily cold formable by standard methods such as bending, stretch forming, roll forming, hammer forming, flaring/flanging, spinning, drawing, and hydroforming. They work harden readily, which is manifested by steadily increasing amounts of force needed to continue deformation. This results in the need to use stronger forming machines and eventually limits the amount of deformation possible without cracking.

A relatively narrow range of temperature can be used for effective hot working of Alloys 309 and 310 due to numerous environmental and metallurgical factors. Forging should start in the temperature range 1800-2145°F (980-1120°C) and finish no cooler than 1800°F (980°C).

Working at higher temperature results in a fall-off of hot ductility due to environmental and metallurgical factors, particularly the formation of ferrite. Working at lower temperatures can cause the formation of brittle second phases, e.g., sigma and/or sensitization. Following forging, the workpiece should be cooled rapidly to a black heat.

SA 213 310S

General Properties
Chemical Composition
Aqueous Corrosion Resistance
Physical Properties
Typical Short-Term Mechanical Properties
Elevated Temperature Oxidation Resistance
Heat Treatment
Fabrication Characteristics

Application
Welding
Other Forms of Degradation


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UNS N08020 Nickel Alloy 20 Tubing
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N06600 600 2.4816 Nickel Alloy Pipe
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ASTM B622 N06022 Hastelloy C-22 Nickel Alloy Tubes
C28000 Brass Seamless Tubes C44300 Brass Seamless Tubes
C68700 Brass Seamless Tubes
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DIN 2391 Seamless Precision Steel Tubes
EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube