Annealed Stainless Steel Wire - High Elongation for Forming

Product Introduction

TOPONE supplies annealed stainless steel wire in 0.15-12 mm diameters for bending, coiling, weaving and redrawing operations that need maximum ductility. The soft annealed condition gives elongation values above 40 percent (A50 gauge), so the wire takes tight bends and deep forms without surface cracking. Tempers, coil weights and surfaces are arranged per order.

Product Specifications

What Elongation Numbers Actually Mean

Elongation is measured by pulling a specimen until it breaks and expressing the permanent stretch as a percentage of the original gauge length. A50 means the measurement was taken over a 50 mm gauge length; the same wire can show a different value on an A80 or A100 gauge, so always compare certificates on the same basis. For annealed austenitic wire, values of 40-55 percent are normal; cold drawn spring wire falls to 5-25 percent because drawing spends part of the ductility as strength.

Why Annealed Wire Forms Without Cracking

Solution annealing dissolves carbides and recrystallises the heavily deformed drawing structure into fine, uniform grains. The result is a soft matrix that distributes strain during bending instead of concentrating it at the outer fibre. This is why fabricators choose annealed wire when the bend radius is small relative to the diameter, or when the part must be redrawn, rolled or swaged after delivery.

Practical Consequences for Fabrication

• Smaller bend radii are possible without heat treatment between passes.
• Less springback than drawn temper, because forming stress stays near the yield point.
• Redrawing to finer sizes can continue without intermediate annealing in many schedules.
• Final strength can be recovered later by cold work or by specifying a drawn temper.

Applications

• Formed and bent wire parts, rings and links
• Redrawing and fine wire production
• Woven and welded mesh weft wire
• Fasteners, staples and clip stock

Product Advantages

• Verified elongation on every batch test certificate
• Uniform soft condition from furnace-controlled annealing
• Consistent diameter tolerance for automatic feeding
• Choice of 302/304/316/430 chemistry per application

Quality Control

Tensile and elongation tests follow ASTM A370 / EN ISO 6892 on samples from each coil lot. Certificates report gauge length, tensile strength, yield and elongation so forming behaviour can be judged before production.

Selection and Ordering Notes

1. State the smallest bend radius and forming method you plan to use.
2. Compare elongation values on the same gauge length as your existing supplier.
3. Choose the grade for corrosion needs first, then confirm the annealed temper.
4. Specify surface: bright annealed for appearance, soap coated for redrawing.
5. Confirm coil weight, spool type and diameter tolerance class.