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BAOSTEEL METAL / PRESTRESSING STEEL

PC Wire & Strand

Prestressed Concrete Steel Wire · 7-Wire Low-Relaxation Strand · Bulk Supply

ASTM A421 / A416GB/T 5223 / 5224PRECAST & POST-TENSIONING
FOR PRECAST & INFRASTRUCTURE BUYERS

Specify your PC steel grade. Get a factory quotation.

Source prestressing steel wire and seven-wire PC strand for your concrete structures. Share the standard, wire or strand diameter, strength class, coil weight and destination port for a quotation based on your project schedule.

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Coils of seven wire prestressing steel strand in a working steel wire factory with visible seven wire construction
8 Million MTActual annual steel production
1 Million MTRegular combined steel inventory
500,000 m²Factory area
1,000+Employees
TWO PRESTRESSING PRODUCT FORMS

Prestressing Steel Wire & Seven-Wire Strand

Choose the finished product form required by your concrete component or post-tensioning system. Each form has its own dimensional and mechanical test requirements.

Individual uncoated prestressed concrete steel wires showing smooth round cross section in a production coil
SINGLE HIGH-STRENGTH WIRE

Prestressing PC Wire

High-carbon steel wire processed and stress-relieved for prestressed concrete reinforcement. Specify wire surface, diameter, strength class, anchorage condition and relaxation requirements.

  • Plain round wire with specified surface condition
  • Diameter selected against the project standard
  • ASTM A421/A421M or GB/T 5223 order requirements
Macro view of seven individual wires helically twisted into one round steel prestressing strand
SEVEN-WIRE PRESTRESSING STRAND

7-Wire PC Strand

A central wire surrounded by six helical outer wires forms a high-strength prestressing strand. Select low-relaxation properties, nominal diameter, grade, reel mass and project-specific test criteria.

  • 1×7 uncoated strand construction
  • Grade 250 [1725] or Grade 270 [1860] reference
  • ASTM A416/A416M or GB/T 5224 order requirements
Purchasing both PC Wire and PC Strand?

Submit your separate diameter, grade, quantity and packing requirements in one RFQ.

SPECIFICATION & SUPPLY

PC Wire & Strand Specifications

Use the material designation from your project documents and provide the detailed product form, grade, dimensions and certificate requirements for order confirmation.

Prestressing Wire — Key Requirements

ProductSingle high-strength steel wire for prestressing
Reference standardsASTM A421/A421M-21; GB/T 5223-2025
Nominal diameterSpecify in mm, with standard tolerance
Surface formPlain, indented or other form where covered by the selected standard
Mechanical requirementsSpecified minimum tensile properties, elongation and relaxation conditions
Anchorage informationSpecify anchorage method if ASTM A421 Type BA / WA applies
PackingFinished coil / reel format, net coil mass and handling requirements

7-Wire Strand — Key Requirements

ProductLow-relaxation uncoated steel strand, 1×7 construction
Reference standardsASTM A416/A416M-26; GB/T 5224-2023
Nominal diameterSpecify metric or ASTM designation
Grade examplesASTM Grade 250 [1725], Grade 270 [1860]
Mechanical requirementsBreaking force, extension/yield, elongation and stress relaxation per ordered standard
DeliveryReel or reelless coil, length, net mass and identification
End usePretensioning, post-tensioning and relevant anchor applications
Specify the standard edition in your purchase order. Product limits, test methods, wire construction and acceptance requirements depend on the selected PC Wire or PC Strand specification.
DIMENSIONS & PERFORMANCE

PC Wire Diameters & PC Strand Reference Sizes

Compare useful nominal sizing references, then request a confirmation for your specified standard, product form, grade and total length.

Single PC Wire — Nominal Size Reference

Theoretical cross-section and mass of plain round wire; example sizes only.

Diameter (mm)Area (mm²)Approx. kg / 1000 m
4.012.5798.6
5.019.63154.1
6.028.27222.0
7.038.48302.1

7-Wire Strand — Grade 270 Reference

ASTM legacy reference size examples; check the applicable current standard edition.

Diameter (mm)Steel area (mm²)Min. break (kN)kg / 1000 m
9.5354.8102.3432
11.1174.2137.9582
12.7098.7183.7775
15.24140.0260.71102

Wire masses are theoretical using 7,850 kg/m³. Strand reference unit masses, steel areas and breaking loads are based on published historical ASTM A416 Grade 270 tables. Final data, testing and acceptance follow the latest specified order standard and mill documents. Diameter references indicate possible enquiry sizes rather than an inventory promise.

STANDARD-BASED PROCUREMENT

Applicable Standards for Prestressing Steel

Use the standard named by your consulting engineer or precast plant specification. Keep steel wire and strand requirements separate.

ASTM A421/A421M-21

Stress-relieved steel wire used in prestressed concrete, including designated wire anchorage types.

ASTM A416/A416M-26

Low-relaxation seven-wire strand, with Grade 250 [1725] and Grade 270 [1860] provisions.

GB/T 5223-2025

Steel wire for prestressing of concrete, effective from May 2026.

GB/T 5224-2023

Steel strand for prestressed concrete, current Chinese standard.

Your grade, relaxation type, delivery condition, surface and test method are defined by the chosen product specification and contract. Supplementary tests can be included in your RFQ.
PRESTRESSING STEEL PROCESS

Wire Drawing, Stranding & Stress Relief

Review the key manufacturing stages and include your required final product properties in the purchase specification.

Industrial wire drawing line processing high carbon steel wire for prestressing material production

Cold Wire Drawing

Controlled drawing reduces the wire diameter and develops the specified strength properties before finished product preparation.

Industrial steel stranding machine helically twisting six wires around a central steel wire to create seven wire prestressing strand

7-Wire Stranding & Low-Relaxation Treatment

Finished strand geometry and thermal-mechanical treatment are controlled according to the requested standard.

01 / MATERIALWire Rod Input

Selected high-carbon steel rod for the required final steel wire properties.

02 / DRAWINGDiameter Control

Cold drawing to the specified wire size and finish.

03 / STRAND7-Wire Formation

Individual wires formed around a central core for strand orders.

WHERE YOUR PRESTRESSING STEEL IS USED

PC Wire & Strand Applications

Prestressing tendons are selected against the structural design and anchorage system. Provide the applicable product standard and project documentation with your enquiry.

Precast concrete bridge girders prepared with prestressing tendons in a bridge construction facility

Bridge Girders & Structural Tendons

Prestressing strand used for pretensioned and post-tensioned bridge structures to engineering specifications.

Precast concrete production yard with railway sleepers or prestressed concrete beams manufactured using single prestressing wire

Precast Concrete & Factory Production

PC wire and strand for precast beams, hollow-core slabs, sleepers and concrete products according to the approved design.

01 / BRIDGES

Bridge Beams & Girders

Strand specified for stressing forces in engineered bridge elements.

02 / PRECAST

Hollow-Core Slabs

Pre-tensioned concrete floor units manufactured to plant specifications.

03 / CIVIL

Concrete Sleepers & Piles

Prestressing steel used in factory-produced concrete units.

04 / STRUCTURES

Post-Tensioned Concrete

Strand selected to the specified tendon, duct and anchorage system.

Ordering for a precast or bridge project?

Attach your strand schedule, strength grade, packing requirements and delivery destination.

WHY BAOSTEEL METAL

Factory-Scale Steel Supply for Project Buyers

Build your procurement plan around actual company-wide manufacturing scale, inventory coordination, defined specifications and export delivery requirements.

01 / SCALE

8 Million MT Annual Production

Our actual annual steel output across all product categories supports production-based sourcing and repeat procurement.

Manufacturing ↗
02 / STOCK

1 Million MT Combined Inventory

Company-wide regular steel inventory supports supply planning. Exact PC wire and strand availability is checked per order.

Steel Inventory ↗
03 / QUALITY

Documented Product Requirements

Define breaking load, relaxation, dimensional checks, coil identity and any witness testing in your RFQ.

Quality Control ↗
04 / SHIPMENT

Bulk Order Coordination

Specify your unit lengths, reel or coil packing, overall tonnage and destination to receive a shipment-focused offer.

Contact Sales ↗
TESTING & CERTIFICATE SCOPE

PC Wire & Strand Quality Inspection

Share your standard edition and mechanical acceptance requirements. Your quotation can specify the material documents and testing included with the supplied coils or reels.

Steel laboratory tensile testing machine measuring breaking force of seven wire PC steel strand

Breaking Force & Relaxation Tests

Relevant mechanical testing and relaxation requirements are evaluated for the actual product form and standard.

Inspection Details for Your RFQ

  • Dimensions — wire or strand diameter and tolerance.
  • Mechanical properties — specified breaking strength, yield/extension and elongation.
  • Relaxation — low-relaxation condition and test acceptance.
  • Traceability — reel / coil identity and material test documentation.
  • Project tests — supplementary requirements where specified.
View Quality Control ↗
LENGTH & COIL PLANNING

PC Wire / Strand Coil Length Estimator

Estimate the length of a single PC wire coil from nominal diameter, or of a seven-wire strand pack from its specified unit mass.

Calculate Estimated Coil Length

Estimated length——

Single wire uses round-section mass at nominal steel density 7,850 kg/m³. Strand length uses its specified steel unit mass, including the actual seven-wire construction, and agreed delivered net coil mass.

Send Your Prestressing Steel Requirements

Include the material and project parameters used by your precast plant or post-tensioning contractor.

  • PC Wire or 7-wire PC Strand
  • Grade, standard edition and diameter
  • Breaking force / relaxation and certificate scope
  • Net coil or reel mass and packaging
  • Total quantity, delivery port and timing
PRESTRESSING STEEL EXPORT PACKING

Reels, Coils & Export Delivery

Define the coil or reel format that suits your unloading equipment, precast line and destination requirements.

Large high tensile prestressing steel strand packed as round reelless coils or steel reel for export handling

Pack to Your Project Order

  • Unit mass — preferred net kg per coil or reel.
  • Reel dimensions — outer diameter, core and handling requirements.
  • Identification — material designation, grade, nominal size and pack identity.
  • Transportation — protective wrapping, lifting, loading and delivery destination.
PRESTRESSING STEEL BUYER QUESTIONS

PC Wire & Strand FAQ

What is the difference between PC Wire and PC Strand?

PC Wire is an individual high-strength prestressing steel wire. A typical PC Strand consists of seven wires helically assembled into one tendon product. Choose the form specified by your concrete structure or prestressing system.

Which standard should I specify for prestressing strand?

ASTM A416/A416M-26 covers low-relaxation seven-wire strand with Grade 250 [1725] and Grade 270 [1860] provisions. GB/T 5224-2023 is the current Chinese strand standard. Include the exact edition and grade in your RFQ.

Which current GB standard applies to PC Wire?

GB/T 5223-2025 is the current Chinese standard for steel wire for prestressing of concrete. ASTM A421/A421M-21 is a relevant ASTM standard for stress-relieved prestressing wire.

What details are required for a PC Strand quotation?

Share the 7-wire strand diameter, grade, minimum breaking force, relaxation requirements, coil or reel weight, tonnage, certificate scope and shipment destination.

Can you include inspection and packing requirements?

State the tensile and relaxation tests, traceability, packaging and receiving-port details in your inquiry. The quotation will confirm the applicable supply and documentation scope.

BAOSTEEL METAL / PRESTRESSING STEEL RFQ

Request Your PC Wire & Strand Quote

Send your wire or strand standard, diameter, strength, relaxation requirement, reel packing and destination for an order-specific factory quotation.

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