MS 1138:PART 2:2007
PRESTRESSING STEEL - PART 2: COLD-DRAWN WIRE
1. Scope
This Malaysian Standard specifies requirements for round, cold-drawn, high-tensile steel wire, either plain, indented, ribbed or crimped. The product is supplied as mill coil wire or straightened and stress-relieved wire in coils or cut lengths, according to the general requirements specified in MS 1138: Part 1.
2. Normative reference
The following normative reference is! indispensable for the application of this standard. For dated reference, only the edition cited applies. For undated reference, the latest edition of the normative reference (including any amendments) applies.
MS 1138: Part 1, Prestressing steel - Part 1: General requirements
3.Definitions
For the purposes of this standard, the following definitions given in MS 1138: Part 1 apply.
4.Conditions of manufacture
The wire shall be manufactured from high carbon steel in accordance with MS 1138: Part 1. The wire shall be supplied without welds or other joints.
5.Surface configuration
There are several types of surface configuration (ribs, indentations, crimps), the purpose of which is to improve bond properties between wire and concrete. The type of surface configuration shall be agreed between purchaser and manufacturer.
Examples of indentations and crimps are given in Annex A.
6.Properties
The designations, data for information and required properties are given in Tables 1 and 2.
6.1 Dimensions and properties of mill coil wire
6.1.1 Dimensions, masses and tensile properties
See Table 1.
6.1.2 Elongation and ductility
The percentage total elongation at maximum force, measured on a minimum gauge length of 200 mm, shall be not less than 1.5 %.
All wires shall show a ductile fracture with a constriction visible to the naked eye.
All wires shall withstand a reverse bend test around the bend radius given in the last column of Table 1. The minimum number of bends is four for plain wires and three for indented and ribbed wires.
Table 1 Dimensions, masses and tensile properties of mill coil wire
| Nominal diameter (mm) |
Nominal tensile strengtha (N/mm2) |
Nominal cross sectional area (mm2) |
Mass per length | Characteristicb | Bend radius (mm) |
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| Nominalc (g/m) |
Permissible deviation (g/m) |
maximum forced (kN) |
0.1 % proof force (kN) |
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| 8 | 1 470 | 50.3 | 395 | ± 5.9 | 73.9 | 59.1 | 20 |
| 8 | 1570 | 50.3 | 395 | ± 5.9 | 79.0 | 63.2 | 20 |
| 7 | 1 570 | 38.5 | 302 | ± 4.3 | 60.4 | 48.3 | 20 |
| 7 | 1 670 | 38.5 | 302 | ± 4.3 | 64.3 | 51.4 | 20 |
| 6 | 1 670 | 28.3 | 222 | ± 3.7 | 47.3 | 37.8 | 15 |
| 6 | 1 770 | 28.3 | 222 | ± 3.7 | 50.1 | 40.1 | 15 |
| 5 | 1 670 | 19.6 | 154 | ± 3.1 | 32.7 | 26.2 | 15 |
| 5 | 1 770 | 19.6 | 154 | ± 3.1 | 34.7 | 27.8 | 15 |
| 4 | 1 670 | 12.6 | 98.9 | ± 2.0 | 21.0 | 16.8 | 10 |
| 4 | 1 770 | 12.6 | 98.9 | ± 2.0 | 22.3 | 17.8 | 10 |
| 3 | 1 770 | 7.07 | 55.5 | ± 1.5 | 12.5 | 10.0 | 7.5 |
| 3 | 1 860 | 7.07 | 55.5 | ± 1.5 | 13.1 | 10.5 | 7.5 |
| a The nominal tensile strength is for designation purposes only and is calculated from the nominal cross-sectional area and the characteristic maximum force and rounded off to the nearest 10 N/mm2. b In view of the small tolerance on mass per length, characteristic forces have been specified rather than stresses. c The mass per length is calculated by adopting conventionally the value 0.00785 g/mm3 as the density of steel. d In order to prove the suitability of the material, which is only used in certain applications (e.g. for railway sleepers, piles or tanks) there is, a requirement for a force at 1 % total elongation to be at least 80 % of the characteristic maximum force. |
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6.1.3 Relaxation
The relaxation at 1000 h at an initial force of 70 % of the characteristic maximum force specified in Table 1 shall be not more than 10 %.
If required, the same test shall be performed at an initial force of 60 % of the characteristic maximum force (see Table 1). The maximum relaxation is then 8 %.
Tableg 2 Dimensions, masses and tensile properties of stress-relieved wire
| Nominal diameter (mm) |
Nominal tensile strengtha (N/mm2) |
Nominal cross - sectional area (mm2) |
Mass per length | Characteristicb | Bend radius (mm) |
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| Nominalc (g/m) |
Permissible deviation (g/m) |
Maximum force (kN) |
proof force | |||||
| 0.1 %d e f (kN) |
0.2 %d f (kN) |
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| 12.2 | 470 | 117 | 918 | ± 10.5 | 172 | 138 | 141 | 30 |
| 12.2 | 1 570 | 117 | 918 | ± 10.5 | 184 | 147 | 151 | 30 |
| 10 | 1 470 | 78.5 | 617 | ± 8.6 | 115 | 92.3 | 94.3 | 25 |
| 10 | 1 570 | 78.5 | 617 | ± 8.6 | 123 | 98.6 | 101 | 25 |
| 9 | 1 470 | 63.6 | 499 | ± 7.2 | 93.5 | 74.8 | 76.7 | 25 |
| 8 | 1 570 | 50.3 | 395 | ± 5.9 | 79.0 | 65.6 | 67.1 | 20 |
| 8 | 1 670 | 50.3 | 395 | ± 5.9 | 84.0 | 69.7 | 71.4 | 20 |
| 7 | 1570 | 38.5 | 302 | ± 4.3 | 60.4 | 50.1 | 51.3 | 20 |
| 7 | 1 670 | 38.5 | 302 | ± 4.3 | 64.3 | 53.4 | 54.7 | 20 |
| 6. | 1 670 | 28.3 | 222 | ± 3.7 | 47.3 | 39.3 | 40.2 | 15 |
| G | 1 770 | 28.3 | 222 | ± 3.7 | 50.1 | 41.6 | 42.6 | 15 |
| 5 | 1670 | 19.6 | 154 | ± 3.1 | 32.7 | 27.2 | 27.3 | 15 |
| 5 | 1 770 | 19.6 | 154 | ± 3.1 | 34.7 | 28.8 | 29.S | 15 |
| 4 | 1 670 | 12.6 | 98.9 | ± 2.0 | 21.0 | 17.5 | 17.9 | 10 |
| 4 | 1 770 | 12.6 | 98.9 | ± 2.0 | 22.3 | 18.5 | 19.0 | 10 |
| a The nominal tensile strength is for designation purposes only and is calculated from the nominal cross-sectional area and the characteristic maximum force and rounded off to the nearest 10 N/mm2. b In view of the small tolerance on mass per length, characteristic forces have been specified rather than stresses. c The mass per length is calculated by adopting conventionally the value 7.85 kg/dm3 as the-density of steel. dFor wires of diameter larger than 8 mm, the characteristic 0.1 % and 0.2 % proof forces are approximately 80 %, respectively 82 %, of the characteristic maximum force. For wires 8 mm and smaller, the corresponding figures are approximately 83 %, respectively 85 %. e The modulus of elasticity shall be taken to be 205 kN/mm2 ±10 kN/mm2, * f 0.2 % proof force is mandatory , 0.1 % proof force is for information only (see MS 1138: Part 1), except when otherwise agreed. This test does not applied to crimped wire. |
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Table 3. Maximum relaxation values
| Initial force in percentage of the characteristic maximum force | Relaxation class | |
| Relax 1 [Normal] (%) | Relax 2 [Low] (%) | |
| 70 | 8.0 | 2.5 |
| 60 | 4.5 | 1.0 |
| 80 | 12.0 | 4.5 |