PC Steel Strand

Tianjin Shunchen Industrial is a leading steel material manufacturer with 12 years of export experience, specializing in high-strength prestressed reinforcement materials. Our Tianjin production base is equipped with 6 fully automatic stranding & stress relief production lines and a national-level material testing laboratory, focusing on R&D and production of plain, indented, galvanized and unbonded PC steel strands matching bridge, tunnel, precast and hydropower engineering.

Unlike ordinary low-relax strands with unstable internal stress, our products adopt high-carbon high-quality wire rod as raw material, precise multi-layer stranding + online tension stabilization technology to form uniform compact strand structure. Our senior QC supervisor with 12 years prestressed material testing experience carries out full-process tracking inspection for each batch, ensuring tensile strength deviation ≤30MPa, 1000h relaxation value ≤2.5%, and strand straightness ≤10mm/m. All products comply with GB/T 5224, ASTM A416, EN 10138 and JIS G3536 standards, and can provide complete mill test certificates (MTC EN 10204 3.1) and third-party SGS inspection reports.

Real-world Performance Testing

1. 1000-Hour Stress Relaxation Test (Third-party SGS Test)

Test Standard: GB/T 21839, ASTM E466

Test Conditions: 70% nominal breaking load, room temperature continuous 1000h aging

Test Samples: Ordinary medium-relax strand, Standard low-relax strand, Premium ultra-low-relax strand

Key Findings:

Ordinary medium-relax strand: Relaxation rate 8.2%, large long-term stress loss

Standard low-relax strand: Relaxation rate 2.4%, stress loss reduced by 71% vs medium-relax

Ultra-low-relax strand: Relaxation rate ≤1.8%, long-term structural deformation fully controlled

2. Breaking Load & Elongation Mechanical Test

Tested under standard static tensile conditions, core performance indicators as follows:

1720MPa grade: Min breaking load ≥184kN, total elongation ≥3.5%

1860MPa grade: Min breaking load ≥260kN, total elongation ≥3.5%

1960MPa grade: Min breaking load ≥275kN, total elongation ≥3.5%

Compact stranding structure avoids wire slip & separation under ultimate load, meeting long-span heavy-load structural safety requirements.

3. Neutral Salt Spray Corrosion Resistance Test

Test Standard: ASTM B117

Test Conditions: 5% neutral salt spray continuous spraying

Test Results:

Plain black strand: Red rust appears after 240h

Hot-dip galvanized strand: No rust after 2200h

HDPE unbonded strand: Internal steel no corrosion after 4800h, suitable coastal salt fog projects

Real-world User Scenarios & Verified Cases

Case 1 Cross-sea Highway Bridge Project (Indonesia Infrastructure Group)

Industry: Transportation bridge engineering

Problem: Tropical coastal high salt fog environment causes rapid strand corrosion; ordinary strands have large relaxation leading to long-term bridge deflection, requiring regular reinforcement maintenance.

Solution: Adopt 15.2mm 1860MPa hot-dip galvanized PC steel strand for main beam prestressing.

Result: After 6 years of bridge operation, beam deflection is within design tolerance, no strand rust phenomenon, annual bridge maintenance cost reduced by 78%. Annual purchase volume reaches 2,100 tons, long-term strategic cooperation for 7 years.

Case 2 Urban Subway Tunnel Pre-stressing Project (Domestic Municipal Construction Co., Ltd.)

Industry: Municipal tunnel engineering

Problem: Underground high humidity & groundwater erosion; common strands are difficult to isolate from concrete, prone to corrosion and stress attenuation.

Solution: Select 12.7mm unbonded HDPE coated steel strand for tunnel lining post-tensioning.

Result: Perfect isolation between steel wire and concrete, zero corrosion after 5 years tunnel operation, one-time pass structural safety inspection, become designated prestress material for all group subway projects.

Case 3 Large-span Industrial Factory Precast Beam Project (Jiangsu Prefabrication Enterprise)

Industry: Prefabricated construction

Problem: Ordinary strands have unstable elongation, easy wire separation during tensioning, high finished beam rejection rate up to 11%.

Solution: Custom indented 15.2mm low-relax PC strand with enhanced concrete adhesion.

Result: Wire slip rate reduced to near zero during tensioning, precast beam rejection rate dropped from 11% to 1.3%, factory tension construction efficiency increased by 55%.

Authentic Customer Reviews

"Coastal cross-sea bridges put strict demands on corrosion resistance and relaxation performance. Your galvanized PC strands maintain stable structural stress for years, our bridge maintenance cost is greatly cut."

—— Aditya Wibowo, Chief Engineer, Indonesia Infrastructure Group

"Underground tunnels are humid all year round. The HDPE unbonded strands we ordered have excellent isolation anti-corrosion effect, complete inspection documents for municipal acceptance."

—— Wang Hao, Procurement Director, Domestic Municipal Construction Co., Ltd.

"Our precast beam workshop needs stable elongation and strong bonding. Your indented strands effectively reduce tension defects, our production yield improved significantly."

—— Chen Lei, Production Manager, Jiangsu Prefabrication Enterprise

Verified Product Parameters

(1) General Execution Standards

(2) Core Technical Parameters

(3) Raw Wire Rod Chemical Composition (wt%)

(4) Representative Mechanical Properties (1×7 15.2mm)

Core Advantages

1. Authoritative Test Data Fully Traceable: All relaxation, breaking load and salt spray data come from SGS third-party labs and long-term major engineering verification, full test reports provided for project filing.

2. Ultra-low Relaxation & Stable Long-term Stress: Professional online stress relief process minimizes stress loss, effectively avoid structural deflection and cracking of long-span bridges and large buildings.

3. Multiple Surface Anti-corrosion Options: Plain, indented, galvanized and unbonded HDPE coated strands to match inland, urban underground, coastal salt fog and severe corrosive environments.

4. Excellent Concrete Bonding Performance: Indented surface design greatly improves mechanical occlusion with concrete, prevents strand slip during tensioning, reduces construction failure rate.

5. Complete Qualifications & Stable Spot Supply: ISO9001 certified, full set of export customs & engineering acceptance documents; large spot inventory supports 3–7 days fast delivery.

Suitable For

· Transportation Engineering: Cross-sea bridges, highway viaducts, railway box girders, cable stayed bridges

· Municipal Construction: Subway tunnels, urban overpasses, underground comprehensive pipe galleries, large stadiums

· High-rise & Prefabricated Buildings: Post-tension floor slabs, precast beams, high-rise transfer beams, large space factory roofs

· Hydraulic & Port Projects: Dam anti-seepage structures, wharf platform prestressing, flood control gate beams

· Special Engineering: Nuclear containment, large storage tanks, wind turbine foundation piles

Why Choose Tianjin Shunchen?

Looking for high-quality low-relax prestressed steel strands for bridge, tunnel and high-rise prestressed projects? Choose Tianjin Shunchen Industrial, a professional PC strand manufacturer with 12 years global export experience, products widely adopted in domestic and overseas landmark infrastructure projects.

We maintain 5,000 tons standard specification spot inventory all year round. Our professional technical team recommends strand diameter, strength grade and anti-corrosion type according to your project environment and prestress design. Factory direct sales without intermediate dealers to guarantee competitive price and consistent batch quality. Contact us now to get free samples and detailed quotations!

Real Product & Shipment Gallery

Production & Quality Inspection

Fully automatic high-speed stranding & stress relief production line

Online diameter & straightness detector (100% coil sampling inspection)

Universal tensile & relaxation testing machine

Salt spray anti-corrosion aging test equipment

Product Display

1×7 15.2mm plain low-relax PC steel strand

Indented prestressed steel strand for precast components

Hot-dip galvanized anti-corrosion bridge strand

HDPE coated unbonded steel strand for tunnel

Shipment & Packaging

Standard export packaging: Waterproof plastic film + woven cloth outer wrapping, steel strip fixed coil

Custom customer brand printed packaging available

Container loading standard: 20ft container ≈22 tons; 40ft container ≈45 tons

Complete shipment documents: Bill of lading, commercial invoice, MTC, third-party SGS inspection report

Customer Application Scenarios

Indonesia cross-sea bridge prestress project

Domestic subway tunnel lining project

Jiangsu precast beam factory supporting project

Hydraulic dam prestressing reinforcement project

Popular Tags

PC steel strand, prestressed steel strand, low relaxation strand, galvanized steel strand, unbonded steel strand, indented strand, bridge prestress strand, China steel strand manufacturer

Related Categories

Wire Rod Coil, Welded Rebar Mesh, Rebar, Galvanized Wire, Color Coated Steel Coil, Galvanized Steel Coil, Checkered Plate, Steel Strip