Spring Steel Flat Wire
spring steel flat wire
Fushun offers an excellent selection of top-quality, ISO certified flat wire steel in a variety of sizes, thicknesses, and shapes such as natural round edge or square edge. Fushun provides an extensive inventory of the finest flat wire products designed, developed and tested by experienced experts.
Among the manufacturers of flat wires, Fushun is the specialist for solutions tailored to customer requirements. Our customers trust our flexibility and innovative strength. Our special flat wires are used everywhere where the highest levels of precision are essential, for example in the automotive, spring, medical, cable and textile industries. We design our flat wires to meet the individual requirements of our customers.
Our core competencies include: Transformation of round wires into flat wires and profiles by drawing and rolling, Annealing and tempering, Coatings, Precision coiling
FUSHUN FLAT WIRE PRODUCTS ARE:
Expertly engineered
Skillfully designed and developed
Rigidly tested
Durable in the most extreme conditions
Reliable in the most stressful applications
1.What is Flat Wire?
Flat wire start as a round wire and then the round wire is rolled (flattened) or die drawn to meet custom requirements through a series of engineered operations.
2.Benefits of Flat Wire
Burr free edges
Close dimensional tolerances
Continuous coil with fewer welds when compared to traditional strip coil
Custom edges such as broken corner, controlled radius, full and natural round, square
3.Flat Wire Applications
Fushun spring steel flat wire has a wide range of applications in many industries including but not limited to:Regulator springs, Industrial springs, Car seat border springs, Conveyor belt fasteners, Key rings, Saw blade wire, Frames, Window mechanisms
4.Production of flat wires made of steel grades C, SiCr, CrV, similar to EN 10270-1 and 2
Quality steels with a carbon content of 0.45% to 1.00%, for example in SM, DM, DH or FD grades
Chromium-silicon steels
Chromium-vanadium steels
5.Production of flat wires made of chromium-nickel grades similar to EN 10270-3
Austenitic stainless steels as materials for traditional hardening by cold rolling. For example 1.4310 (AISI 301 or 302), 1.4301, 1.4370, 1.4401 and many similar grades.
Martensitic stainless steels. These steels can be hardened by tempering after rolling. For example for grades as per 1.4006 (AISI 410), 1.4021 or 1.4028 (AISI 420), 1.4568 etc.
Ferritic stainless steels For example as 1.4016 (AISI 430)
Austenitic-ferritic grade For example as 1.4462 (duplex)
*Special materials on customer request
6.Delivery Condition:
Cold rolled to your individual requirements or based on DIN EN 10270-1. In this process, the cross-section of the flat wire profile is converted into the cross-section of a round wire to enable application of the round wire standard.
Hardened + annealed to your individual requirements or based on DIN EN 10270-2. In this process, the cross-section of the flat wire profile is converted into the cross-section of a round wire to enable application of the round wire standard.
Annealed to your requirements
Finish annealed to your requirements
7.Dimensions:
Thicknesses: 0.10 – 2.00 mm
for rectangular or square up to 3.50 mm
Width: 0.50 – 7.00 mm
8.Tolerances:Depending on size and grade
Thickness: ± 0.02 to < 0.01 mm
Width: ± 0.1 to < 0.05 mm
For particularly high-precision tolerances, we check to ensure that the requirements are technically and economically feasible.
9.Edge shapes:
Mill edge/Rolled edges/Rounded edges/Machined rounded edges
10.Surfaces:
Bare/Slip-coated/Phosphated/Polished
11.Package options:
In layers wound on:Coils/Cardboard cores/Coreless Weight per unit of 40 – 1000 kg
The edge is where the crack starts
Spring steel flat wire is usually bought by width, thickness and hardness, and the edge condition is left to the supplier. That is a mistake: a slit edge carries shear marks and micro-cracks running into the section, and under cyclic stress those are crack starters.
Dressed edges remove the shear zone by machining and roughly double the fatigue life. Rounded edges remove the stress concentration entirely, which is what a high-cycle spring needs.
Specifying it
Write “dressed and rounded edges, no shear marks on the tension side” rather than leaving the field blank. On a stamped part the same rule applies to the burr: it must face away from the tensile stress, and if the drawing does not say which side, the press shop will choose.
Where it is ignored
Most fatigue failures on flat wire springs are traced to the edge, not the steel. A change of grade is the usual response and it rarely fixes anything — the edge condition travels with the part regardless of what it is made from.
