Stainless Steel UNS S24100 Special Alloys For Automotive Good Ductility Design

Stainless steel UNS S24100 (Nitronic 32, XM-28) for automotive hose clamps, springs, wires etc

1 PRODUCT

Stainless steel UNS S24100 (Nitronic 32, XM-28) for automotive hose clamps, springs, wires etc.

Product available in forms of bar, rod, wire, spring, forging billets, sheet, strip, foil, extrusions, seamless tubing etc.

2 APPLICATION

Clamps for pole line hardware, concrete reinforcing accessories, abrasion and corrosion resistant screens, high strength non-magnetic springs, wire forms, racks, cages, etc.

3 OVERVIEW

Nitronic 32 is an austenitic stainless steel that has almost twice the yield strength of 304 and comparable corrosion resistance. The alloy has high work hardenability which leads cold working to high strengths while maintaining good ductility.

4 CHEMICAL COMPOSITION (wt%):

5 PHYSICAL PROPERTY

Density at 70°F (21°C): 7.781 g/cm³ (0.281lb/in³)

Modulus of elasticity in tension: 28.9 x 10³ ksi (199.2 x 10³ MPa)

Magnetic Permeability: H = 200: Annealed: < 1.02, 70% Cold Worked: <1.011

Thermal expansion

6 MECHANICAL PROPERTY

Annealed Typical at room temperature

Ultimate Tensile Strength: 120 KSI min (793 MPa min)

Yield Strength: 60 KSI min (414 MPa min )

Elongation: 55% min

Hardness: Rb 95 min

7 CORROSION RESISTANCE

Refer to NACE (National Association of Corrosion Engineers) for recommendations

8 WORKING INSTRUCTION

Forging

Heat to 2000°F, soak to equalize, then heat to 2150°F and equalize prior to forging.

Annealing

Soak at 1900-2050°F, quench quickly in air or water.

Hardening

Hardening this alloy requires cold working. It will not harden with exposure to thermal treatment.

Machinability

Slow speeds, positive feeds and abundant resulphurized lubricant are essential to success in machining this alloy. Speeds and feeds similar to those employed with 316 or 317 stainless are appropriate here. All common machining practices can be used on this material. Chips will be tough and stringy and it is recommended that curlers or breakers are used.

Forming

Pre-heating is not required with this material and all common welding methods including gas tungsten arc, gas metal arc and submerged arc are acceptable. Filler metal selection should be of similar chemistry for maximum strength and resistance to intergranular attack.

Weldability

Early experience with NITRONIC 32 stainless shows good welding characteristics. It can be fusion welded with the usual arc welding processes employed for austenitic stainless steels. NITRONIC 32 provides superior ductility and toughness, as well as resistance to weld cracking without the need for preheating or post heating, as most martensitic and heavy gage ferritic stainless steels require.

9 STANDARD SPECIFICATION

ASTM A276(XM-28) Bars and Shapes

ASTM A313(XM-28) Stainless Steel Spring Wire

ASTM A314(XM-28) Stainless and Heat-Resisting Steel Billets and Bars for Forging

ASTM A580(XM-28) Stainless steel wire

10 COMPETITIVE ADVANTAGE:

(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.
(4) Ultra-purity smelting process VIM + IG-ESR + VAR.

(5) High performance material.

11 BUSINESS TERM