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Standards Development
The document specifies the technical requirements for cold-reduced steel wires with diameters of 5 mm to 12 mm, which are designed for the reinforcement of concrete and the manufacture of welded fabric. Based on Cold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric-ISO105441992and market demand, the reference document, mass deviations, product types, chemical composition and performance requirements will update in this project. The details are as follows
1. Normative references: Updating the reference documents.
2. Dimensions masses and tolerances: Strict control of single weight deviation of steel wire.
3. Geometry of ribs and indent lines: Add shape and character definition of two ribsrevise the requirements of rib spacing.
4. Chemical composition: Revise the requirements of chemical composition.
5. Characteristic values for proof stress: Add a high strength steel grade and performance requirements
The current market environment is in great demand for cold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric. For the requirements of cold -reduced steel wire, the major enterprises in the industry generally refer to national or regional standards, and there are many differences in these standards, which affect the smooth progress of international trade business, and may cause conflicts and increase unnecessary costs. As an international standard approved by all countries, Cold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric-ISO 10544 should play its reference and guide role. However, theCold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric -ISO 105441992 was developed for 28 years and cannot meet the current development needs such as
1. The cited standards should be updated in time, including testing, certification, inspection, delivery, testing, etc., to meet the existing use requirements of product production and application units. Such as: Reinforced Concrete - Bending and Rebending Tests - ISO 10065 1990are void and should be replaced by new testing standards.
2. The requirement of product quality deviation is wide, which is not conducive to the control of dimensional uniformity of steel wire, and then affects the stability of product performance.
3. Some types of steel wire with large market demand are not specified, such as cold rolled ribbed steel wire with two ribs.
4. The content of phosphorus and sulfur in the chemical composition is high, which is not conducive to the improvement of product quality.
5. A product grade with yield strength above 500 N/mm2 and its performance requirements are not specified.
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