PC strand

PC Strand, or prestressed concrete steel strand, is a twisted steel cable composed of 2, 3, 7 or 19 high strength steel wires and is stress-relieved (stabilized) for prestressed concrete or similar purposes.

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Classification

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PC strand is classified according to the number of steel wires in a strand: 2 wire strand, 3 wire strand, 7 wire steel strand[1] and 19 wire steel strand. It can be classified according to the surface morphology and can be divided into: smooth steel strand, scoring strand, mold pulling strand (compact), coated epoxy resin steel strand. They can also be classified by diameter, or intensity level, or standard.

 

Specifications

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In the description and list of the table we often see, there are 15-7Φ5, 12-7Φ5, 9-7Φ5 and other specifications of the prestressed steel strand. To 15-7Φ5, for example, 5 said a single diameter 5.0mm of steel, 7Φ5 said seven of the steel wire to form a strand, and 15 that the diameter of each strand of 15mm, the total meaning is "one The beam consists of 7 strands of diameter 15 mm (each having a total diameter of about 15.24 mm, a dimensional deviation +0.40 -0.20; a diameter of about 5.0 mm per filament). The general sectional area is calculated according to 140mm ^ 2. The theoretical breaking value is 140 * = 260.4 kN, which can withstand the tension of 156.24-169.26 kN according to the prestressing standard of 60% -65%.

 

Materials

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Using high-carbon steel wire rod, after surface treatment it is cold drawn into steel wire, and then the strand structure will be a number of steel wires stranded into shares. Next the elimination of stress by way of a stabilization process. In order to extend durability, the wire can have metal or non-metallic coatings, such as galvanized, or epoxy resin coating. In order to increase the bond strength with the concrete, the surface can have nicks and so on. The prestressed strands of the mold are twisted to form a mold compression process, the structure is more compact, and the surface layer is more suitable for anchoring. Production of unbonded prestressed steel strand (unbonded steel strand) using ordinary prestressed steel wire, coated with oil or paraffin after the packaging into high-density polyethylene (HDPE) bags.

 

Features

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The main characteristic of the prestressed steel strand is high strength and relaxation performance is good, the other when the more straight. Common tensile strength levels of MPa, as well as , , , , MPa and the like intensity levels. The yield strength of this steel is also higher.

 

Application

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In most of the post-tensioned and pre-tensioned prestressed project, smooth steel strand is the most widely used prestressed steel. Stranded strand is mainly used to enhance the project, but also for nuclear power and the like works. Galvanized steel strand commonly used in the bridge of the tie rod, cable and external prestressing works. Epoxy coated steel stranded wire is similar to galvanized prestressed steel wire.

 

Standards

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Countries have standards for prestressed strand, such as: China Standard GB / T , American Standard ASTM A416, British standard BS and the Japanese standard JIS G, the Australian standard AS / NZS , Brazilian standard NBR-[2]

 

References

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Prestressing Concrete Single Wires and Stranded Wires

Kinwey offers Prestressed Concrete Wires (pc wire) in mainly two types: Mono pc wire and Multi-wire strand.

PC steel wires are widely used in concrete construction industry for pre-stressed steel structures: large-span bridges ( stay cable system), overhead crane beam, cement poles, coal mines rock-soil anchoring project, multi-storey frameworks (slab and hollow floors), subway, railway sleepers, dams, shell safety of nuclear power stations, high-rise buildings (television tower, water towers, concrete silo, sewage treatment, hydropower project, stadiums) and etc.
Quality: ASTM A-416, BS , JIS G, the standards and cutomized specifications.
Common wire materials for production: High tensile wires, plain or galvanized.

The process involves the continuous heating and stretching of a cold drawn high-carbon steel wire to produce a finished product with a much improved yield stress and greatly reduced load relaxation.

PC Wire / Strand Classifications

Prestressing concrete steel wire can be divided according to wire diameter, the intensity level, the surface coating or cross-section:
1. According to diameter, PC steel wire can be categorized as: 4mm, 4.8mm, 5.0mm, 5.1mm, 6.0mm, 6.35mm, 7.0mm, 7.8mm, 8.0mm, 9.0mm, 10.0mm, 11mm, 12mm and so on.
2. According to tensile strength, pc wire can be classified as: MPa, MPa, MPa, MPa and MPa.
3. According to the surface coating, pc wire can be classified as: uncoated prestressed steel wire, prestressed epoxy coated steel wire and galvanized prestressed steel wire.
4. According to forms of the surface, it can be classified as: Round plain wires, spiral ribbed (spiral ribbed or helix grooved) steel wires, crimped wires, slotted (indented) wires, and so on.
5. According to wire treatment process, pc wire can be categorized as follows: cold-drawn pc wire and low relaxation pc wire.
6. According to wires applied, pc wire can be classified as single individual pc wire and helically stranded wire ( pc strand).
7. According to applications, pc wire / strand can be divided into:
Un-bonded strand: zinc coated, grease filled; uv stabilized polymer sheath, for post tensioning
Bonded strand, retardant, galvanized bright, with PE shielding, for stable cable, suspension wire cable for bridge construction
8. According to structures, stranded wire can be classified into 2 wire strand, 3 wire strand or 7 wire strand mostly.

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Additional reading:
Cast Iron Model

Prestressing steel wire / pc wire, functions differently compared with reinforcing steel (rebars):

Post-tensioning is very useful to defeat the natural weakness of concrete in tension and to optimize its strength in compression. In concrete structures, using high-tensile steel wire / strand placed in the element prior to casting will:
1, Reduces occurrence of cracks . 
2, Increase in durability. 
3, Less deformations (improved serviceability).
4, Increase in shear capacity.

Since concrete is weak in tension, the reinforcing steel bar / rebar is used inside concrete for strengthening and reinforcing the tensile strength of concrete. Reinforcing steel bars are used to absorbs the tensile, shear, and sometimes the compressive stresses in a concrete structure.

Newly Exported Products

PC Wire, PC Strand Wire, PC Steel Wire For Vietnam,
PC Steel productions as below:
Comm : PC STEEL BAR/PC WIRE
Size: Φ7.1 , Φ9.0, Φ6 , Φ5

PC Wire 0.5" size for Bridge Project. in Lahore (Pakistan).

High Tensile Steel Wire (low Relaxation Prestressed Concrete Wire ) For Amman &#; Jordan
Bright plain high tensile steel wire of 7mm diameter as specified :

1 Steel required has to be bright plain-high tensile steel wire7mm diameter and will be used in manufacturing prestressed concrete poles for medium voltage networks. 2 The steel should conform in all respects with the requirements of the latest edition of BS. or Chinese specifications [prestressed wire 7.00--WLR-P-GB/T/] or equivalent. 3 The nominal tensile strength of the steel should be (N/mm2). 4 The steel should be of Low relaxation &#;quality and the wire is pre-straightened and will run out straight form the coil when used at site. 5 No joint is allowed in the wire which should be one piece in the coil. 6 Steel shouldbesuppliedinlargediametercoilsof1.8 -2.4m. 7 The weight of Each coil should be approximately Kgs. 8 The packing o f each coil ensures good protection to the steel during loading, shipping, unloading, transportation, and storing at the site of the purchaser. For that, every coil is tightly wrapped by proper and secure seaworthy packing. 9 Each coil has a separate label made of steel sheet with a reason able size. 10 Mechanical and other relevant tests should be carried out on sufficient number of samples from the materials. Our engineer will operate these tests in the laboratory. The purchaser has the right of testing some samples in a 3rd party (for example SGS) laboratory at the manufacturer Expense.

Uncoated 7 Wires PC Strands With Following Sizes ( ½ And 0.6 Inches ) For In Uae And Oman.
Grades : low relaxation according to ASTM- 416 , Grade 270 ( MPa).

7 Wire PC Strand, 15.24mm (ASTM A416 Gr 270 Low Relaxation) , 2.0ton &#; 3.5tons per coil

 

PC indentened Wire for Damascus
Straightened indented cold drawn pre-stressed steel wires of nominal diameter 7 mm.
according to the EN /4/979 or BS /80
- Nominal tensile strength: N/mm2
- Yield limit : N/mm2
- Guaranteed Yield point: at 0.2 % of permanent elongation N/mm2.
- Deflections : Max. 12 mm in 1 meter long.
- Diameter tolerance : 7 mm ± 0.05 mm
- Relaxation: Class 1 or Class 2
- Weight of Coil : manufacturer Choice , preferable less than Kg .
- Coil nominal inner diameter: - mm.
- Coil nominal outer diameter: about mm.
- Indentation depth: 0.15 mm± 0.05 mm , three indented faces with angle 45° , pitch 8 mm.

PC still wire for prestressed concrete railways sleepers, diameter 3 mm for Damascus
Specifications of the material (tensile strength; surface; coils weight, standard).
- Materiral : Prestressed concrete pc wire steel dia 7mm.
- Standard ACC BS &#; and EN 138/4/ OR equivalent
- Tensile strength : N/mm2.
- proof strength : N/ MM2.
- Diameter :7 mm.
- Relaxation :class1.
- deviation :max 12mm for L1m.
- the Surface:
indented pc wire steel.
indent depth 0.15 mm +- 0.5.
indented on three faces at a 45 degree angle.
- Coils weight: (500 , 700) kg.
- Interior diameter (-)mm
- Outer diameter of the coils approx. ( ) mm.
Standard: all Production (pc wire), control and testing according to above standard.
- inspection :
will be by a neutral third party, through a competent inspection company selected by payer.
- Diameters :7 mm. - Tolerance of diameter 7mm +-0.5
- Quantity: 300 ton.
Delivery syria port( lattakia)

PC Plain Cold Drawn Wire 4 mm Diameter For Germany
PC wire strand 4mm
PC wire strand 5mm

Spiral Steel Wire-OD2.7mm for Malaysia&#;
NTW Wire - Non Tensions Wire-OD6mm
Prestressed PC Wire- 4 side indented oval shave
Size: OD 5mm
OD 7mm

Supply Prestressing Steel Wire 140/160 Dia 9.4mm In Length mm, Round Smooth, Cold Drawn Acc. To En-2
Material grade:smooth wire st/ min.
Size:dia.9.4mmxmm length

Galvanized Steel Strand
The vertical hot-dip galvanized technology ensures coating thickness.
Common structure: 7 strands / 19 strands
Application: for ACSR, stay wire, Guy wire, barrier cable, guardrail strand, overhead earth wire
Material: high carbon steel
Galvanized steel wire size: Φ1.44mm-4.770mm
Strand size:7×&#;1.44-4.2 mm&#;;19×&#;1.44-3.5mm&#;
Tensile strength: different Grade from min. N/mm2 to min.N/mm2
Zinc coating: According to ASTM A475 Class A
Meets ASTM Specifications A475 or A363 or ASTM B498 or BS EN

PC Steel Wire S Grooved, Supply to Iran

Name

pc steel wire Designation Diameter 4mm 4.8mm 5mm 6mm 7mm Grade ASTM A 421 Nominal cross section area (mm2) 18.7 Diameter Tolerance 0.00mm / ± 0.05mm Yield stress (N/mm2)

 Min.

Tensile stress (N/mm2) Min. Elongation (%) 3.5 Min. Relaxation (%) 2.0 Max. Groove number 4 Groove direction S

Cold Drawn PC Wire in Coils
Material: Prime Alloy Steel Wire for in coils for prestressing of concrete
Technical Specifications:
- Designation as per British Standard BS /2 Wire--7-DE-relax 2
Explanation of designation (Basic specifications)
- Standard BS -section 2
- Diameter of Wire: 7 mm.
- Surface condition: smooth (E)
- Tensile strength: MPa
- Relaxation : class 2 (1% @ 60% initial load, 2.5% @ 70% initial load and 4.5% @ 80% initial load)
- Coil outer diameter: 2.3 m. max.
- Yield stress (0.1 proof Stress): MPa
- Elongation: 3.5%
- Ductility: 4 Times 20 mm. Bending
Packing: Mill's Standard with Coil Weight of - Kg.

Indented PC Wire, Steel
- Materiral :
Prestressed concrete pc wire steel dia 7mm.
- Standard ACC BS &#; and EN 138/4/ OR equivalent
- Tensile strength : N/mm2.
- proof strength : N/ MM2.
- Diameter :7 mm.
- Relaxation :class1.
- deviation :max 12mm for L1m.
-the Surface:
indented pc wire steel.
indent depth 0.15 mm +- 0.5.
indented on three faces at a 45 degree angle.
- Coils weight: (500 , 700) kg.
- Interior diameter (-)mm
- Outer diameter of the coils approx. ( ) mm .
- Diameters :7 mm. - Tolerance of diameter 7mm +-0.5
Delivery to Syria

PC Bars
Steel Bars for manufacturing of PC Poles and Spun Piles.

Prestressed PC Steel Wire, Diameter, Intensity, Types and Application.

 

Prestressed PC Steel Wire

 

High Tensile Prestressed PC Steel Wire for Concrete

Intensity: Mpa-Mpa.

Standard: ASTM, BS, DIN, GB.

Wire Diameter: 4.00mm-12.00mm.

Types of prestressed PC steel wire:

According to diameter and can be categorized as: 4mm, 4.8mm, 5.0mm, 5.1mm, 6.0mm, 6.35mm, 7.0mm, 7.8mm, 8.0mm, 9.0mm, 10.0mm, 11mm, 12mm and so on.

According to intensity level can be classified as: MPa, MPa, MPa, MPa and MPa.

In accordance with the surface coating, high tensile PC steel wire can be classified as: no coating prestressed steel wire, prestressed epoxy coated steel wire and galvanized prestressed steel wire.

In accordance with the surface morphology can be classified as: light round prestressed steel wire, spiral rib (spiral ribbed or helix grooved) prestressed steel wire, the pressure wave (crimped) prestressed steel wire or nicks (indented) prestressed steel wire and so on.

In accordance with treatment process can be categorized as follows: cold-drawn prestressing steel wire (no slack performance requirements) and low relaxation prestressed steel wire.

Prestressed PC steel wire application: Prestressed concrete strand is used of prestressed concrete structure reinforced, such as large-span bridges on railway and highway, overhead crane beam, rock-soil anchoring project, multi-storey industrial buildings, stadiums, mines and etc. PE coated steel strand for prestressed concrete is suitable for large-span and large bays cast-in-place concrete floor, large load of precast beams and other special structure.

Many other steel wire and steel strand products:

Tensile Strength Requirements Nominal Diameter, mm(in) Tensile Strength, min, Mpa (psi) Type BA Type WA 4.88(0.192) (250 000) 4.98(0.196) (240 000) (250 000) 6.35(0.250) (240 000) (240 000) 7.01(0.276) (235 000) (235 000) Yield Strength Requirements Nominal Diameter, mm(in) Internal StressMPa (psi) Minimum Stress at 1%  Extension, Mpa (psi) Type BA Type WA 4.88(0.192) 200(29 000) (212 500) 4.98(0.196) 200(29 000) (204 000) (212 500) 6.35(0.250) 200(29 000) (204 000) (204 000) 7.01(0.276) 200(29 000) (199 750) (199 750) BS- Diameter and deviation mm Nominal size m Nominal Weight g/m Minimum breaking load KN Nominal tensile strength Mpa 4.0±0.04
4.5±0.05
5.0±0.05
6.0±0.05
7.0±0.05 12.60
15.90
19.60
28.30
38.50 99.9
125
154
222
302 21.0
22.3
25.8
32.7
34.7
47.3
50.1
60.4
64.3

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