48Si7 1.5021 Alloy Spring Steel Strip

BS EN 10132-4 48Si7 1.5021 Alloy Spring Steel Strip

Dimensions and tolerances
Thickness: 0.1 to 5 mm; Tolerances: +/- 0.008 to 0.11 mm
Width: 10 to 400 mm; Tolerances: +/- 0.15 to 0.60
*accept nonstandard size, please contact with our sales.

Our Advantage
1. Precise thickness, uniform hardness. Bright surface, smooth edge.
2. High flatness of board surface, high performance after multiple bending.
3. No cracking after stamping, and the quality is stable. And we provide Self-Inspection Reports and Raw-Material Test Certificates.
4. Professional anti-rust protective packaging. On time delivery, competitive price.
5. Large stock available, no MOQ requirement

48Si7 1.5021 Alloy Spring Strip Chemical composition

48Si7 1.5021 Alloy Spring Strip Mechanical properties

48Si7 1.5021 Alloy Spring Strip Delivery condition

Cold rolled narrow steel strip covered by EN10132-4 shall be supplied in one of the following delivery conditions:

-annealed or annealed and skin passed(+A or +LC);

-cold rolled(+CR);

-quenched and tempered(+QT).

NOTE The delivery condition-annealed to achieve spheroidized carbides(+AC)-may be agreed. In such cases, limits on spheroidization and mechanical properties may also be agreed at the time of enquiry and order.

48Si7 1.5021 Alloy Spring Strip Decarburization

For silicon alloyed steels, decarburization shall not exceed 3% of the material thickness per side,for non silicon alloyed steels, decarburization shall not exceed 2% of the material thickness per side when measure data distance of 5mm from the stripe edge

48Si7 1.5021 Alloy Spring Strip Surface finish

The surface finish of cold rolled narrow steel strip shall be bright as produced by rolling and annealing in a controlled atmosphere.

The surface finishes of quenched and tempered cold rolled strip are as follows:

1 grey/blue oxide finish:unpolished;

2 brigth tempered:unpolished

3 polished: obtained by fine grinding, abrasive brushing or other processes;

4 polished and coloured:blue or yellow colour obtained by oxidization by heat treatment.

48Si7 1.5021 - specifications and application

Silicon spring steel is one of the most popular, simple, basic and at the same time the longest used grades in the production of spring elements and springs in the automotive industry and railroading.

Silicon steels are characterized by high strength properties, low ductility, resilience, susceptibility to decarburization, resistance to medium loads, low hardenability, and difficult welding.

48Si7 1.5021 steels, as well as replacements EN/DIN 48Si7 1.5021 have similar concentrations of alloy additives - including Silicon, which is responsible for the resilience of steel. Differences in grades result from the concentration of carbon, responsible for obtaining the appropriate hardness after heat treatment.Silicon steel, found mainly in the form of round bars and hot rolled flat bars, is used for the production of spiral, disk, bumper, cone, coil and flat springs, springing rings and spring washers, springs for cultivators, springs of steam locomotives, personal and goods wagons, flat vehicle springs rail, spring plates, safety valve springs and check valves.

48Si7 1.5021 Alloy Spring Strip Mandatory information

The following information shall be supplied by the purchaser at the time of enquiry and order to enable the supplier to comply with the requirements of this European Standard:

a) the quantity to be delivered;

b) the designation of the product form (cold rolled narrow strip);

c) the number of the dimensional standard (EN 10140);

d) the dimensions and tolerances on dimensions and shape and, if applicable, letters

denoting relevant special tolerances;

e)the number of this European Standard including the number of the relevant part;

f) steel name or steel number

g) the delivery condition

h) if required, the type of inspection document in accordance with EN 10204.

48Si7 1.5021 Alloy Spring Strip Inspection and testing

verification of the dimensions

visual examination of the surface quality

Chemical analysis

Extent of testing

Tensile and bending tests

Tolerances on shape