BS EN 48Si7 1.5021 Annealed Spring Steel Strips

Grade : 48Si7

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 Annealed Steel Strips Chemical composition

48Si7 1.5021 Annealed Steel Strips Mechanical properties

48Si7 1.5021 Annealed Steel Strips 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 Annealed Steel Strips 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/Annealed oxide finish:unpolished;

2 brigth tempered:unpolished

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

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

48Si7 1.5021 Annealed Steel Strips 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.

We hold expertise in providing a qualitative range of Blue Tempered Steel Strips to our clients at affordable prices. Owing to features like high efficiency, optimum performance and durable finish standards they are highly demanded in the market. Our ranges of these are used in various industries like automobile, cable and electronic industries.

In annealed and lightly rolled materials, they exhibit a large degree of elongation, and can withstand complex processing. Springs are used in plenty of applications in the present-day world. Even so, only a few people have a nodding acquaintance with the brass tracks of spring manufacturing and the different qualities needed for various functions. While coiling steel into a spiral of desired length and diameter is the primary and center-most stage of spring fabrication, other treatments during and after the procedure determine the quality of the product that reaches the consumer.

48Si7 1.5021 Annealed Steel Strips 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

high carbon steel Annealed tempered spring steel strip is harder, less bendable, and has a higher degree of spring back. Finished products made from this material have better edge retention, which correlates to the material's other properties. Annealed spring steel strip is used widely in the manufacture of springs, prominently in automotive and industrial suspension applications. It is a high carbon steel with a very high yield strength. This material allows objects made of spring steel to return to their original shape despite significant deflection or twisting.

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 steels, as well as replacements EN/DIN 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 Annealed Steel Strips 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
• Any requirement from clients