The 2010 edition of IS 6003 outlines the standards for indented hard-drawn and stress-relieved steel wire utilized in prestressed concrete structures. It details the manufacturing criteria, chemical and physical characteristics, testing protocols, and quality assurance measures for wires with nominal diameters between 2.50 mm and 8.00 mm. This code is crucial for engineers, suppliers, and manufacturers to guarantee dependable reinforcement performance and durability.
Overview
The 2010 edition of IS 6003 outlines the standards for indented hard-drawn and stress-relieved steel wire utilized in prestressed concrete structures. It details the manufacturing criteria, chemical and physical characteristics, testing protocols, and quality assurance measures for wires with nominal diameters between 2.50 mm and 8.00 mm. This code is crucial for engineers, suppliers, and manufacturers to guarantee dependable reinforcement performance and durability.
Audience
Contents
Structure
This section defines the scope covering the production, supply, and testing of indented hard-drawn and stress-relieved wires for prestressed concrete. It includes chemical composition, diameter, tensile properties, and proof stress requirements, with sampling criteria and testing limits expressed as statistical formulas. Additional nominal diameters of 2.50 mm, 7.00 mm, and 8.00 mm are incorporated. Compliance follows IS 1387 for inspection and testing, IS 228 for chemical analysis, and IS 1608 for tensile testing.
This chapter lists the key standards referenced, including IS 228 for steel chemical analysis, IS 1608 for tensile testing, and IS 1387 for general supply and inspection protocols. It elaborates on the acceptance criteria formulas for chemical and mechanical property testing and details the rounding off rules as per IS 2:1960. The requirements for certification and marking under the BIS Act, 1986 are included.
Clarifies essential definitions such as nominal wire size, which is the diameter of a plain wire having equivalent mass per unit length to the indented wire. It specifies that indentations must be arranged in two diametrically opposite staggered lines and conform to agreed patterns. The section also describes the rounding convention for reported test results.
Details the production process requiring cold drawing of steel made by approved methods including open hearth, electric duplex, acid Bessemer, or basic oxygen processes, with alternative methods subject to purchaser approval. It prohibits welds in finished wires and mandates traceability through markings linking materials back to original steel casts. Manufacturer's certificates must accompany deliveries.
Defines nominal diameter as the diameter of an equivalent plain wire based on mass per unit length, with a tolerance of ±0.05 mm. The indented wire features elliptical or round indentations arranged in specified staggered patterns. The section includes formulas to calculate nominal diameter from mass and density and highlights prohibition of welds in the final product.
Specifies measurement methods for diameter and ovality, with two measurements at right angles across three locations averaged over a length of at least 250 mm. Diameter tolerance is ±0.05 mm. Ovality limits determine whether mass checks by weighing are necessary. Tables provide nominal mass and tolerances for each wire diameter. Statistical acceptance criteria for chemical and mechanical properties are reiterated.
Outlines the acceptance criteria for chemical makeup, diameter, tensile strength, and proof stress using statistical parameters. Describes ovality checks linking to mass verification. Provides minimum elongation values after fracture for various wire diameters, measured on a 200 mm gauge length. Emphasizes rounding rules and covers additional nominal sizes.
Defines sampling sizes according to lot quantities, ranging from three coils for lots up to 25 coils, up to ten coils for lots exceeding 300. Testing includes tensile strength, elongation, relaxation tests under specified loads and temperatures, with requirements for documentation and manufacturer test records. Ensures representative and statistically valid sampling.
Describes conformity evaluation of lots based on compliance with specified clauses. Details ductility testing protocols including doubling sample size upon initial failure and mandatory passing of retests. Inspection and testing adhere to IS 1387 procedures. Includes flowcharts to illustrate pass/fail decision processes ensuring stringent quality control.
Specifies that shipment and inspection comply with IS 1387 unless otherwise noted. Materials cannot be dispatched without purchaser certification or if carrying the BIS Standard Mark. Manufacturer certificates must accompany shipments, containing detailed manufacturing and test data linked to product batches. Ensures traceability and compliance during delivery.
Sets requirements for coil dimensions (approximately 1.5 m diameter), mass agreed upon between buyer and supplier, and minimum ligatures per coil for securing. Indentations must be arranged in two opposite staggered lines as per agreed patterns. Manufacturers must maintain mill records correlating coil identification with test data. BIS certification marking conditions are governed by the BIS Act.
Provides information on the committee responsible for this standard (Concrete Reinforcement Sectional Committee, CED 54). Summarizes sample size selection based on lot sizes and reiterates conformity criteria with statistical acceptance formulas for chemical and mechanical characteristics, ensuring consistent quality control.
Frequently Asked
IS 6003 defines the nominal diameter as the diameter of a plain wire with equivalent mass per unit length to the indented wire, with an allowed tolerance of ±0.05 mm. Diameter is measured by averaging six micrometer readings taken at three locations over a length of at least 250 mm, with two measurements at right angles at each location. Newly added nominal sizes include 8.00 mm, 7.00 mm, and 2.50 mm.
The standard mandates that wire must be cold drawn from steel produced by approved methods such as open hearth, electric duplex, acid Bessemer, or basic oxygen processes. Use of other steelmaking methods requires prior approval from the purchaser. Finished wires must be free from welds or joints, and traceability to the original ingot or billet must be ensured through identification markings.
Minimum tensile strength values vary by nominal diameter, for example, 1375 N/mm² for 8.00 mm wire and 2010 N/mm² for 2.50 mm wire. Proof stress must be at least 85% of the specified minimum tensile strength. Test results must satisfy statistical quality control limits where the mean plus 0.6 times the range does not exceed the maximum specification limit, and the mean minus 0.6 times the range is not below the minimum limit.
Elongation after fracture is defined as the percentage increase in length of a tensile test specimen after breaking, relative to its original gauge length. Testing is performed as per IS 1608, involving tensile loading until fracture on a specimen with a standard gauge length, typically 200 mm. The elongation percentage is calculated by measuring the change in length post-fracture, ensuring material ductility requirements are met.
Sampling sizes depend on lot size, ranging from three to ten coils. Tests include tensile strength and ductility, following IS 1387 and IS 1608 standards. If any initial ductility test sample fails, twice the original number of samples are tested, and all must pass for lot acceptance. Manufacturer certification and compliance with BIS marking requirements complete the conformity assurance process.
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