Minimum grade tensile strength based on the nominal steel area.
Global Steel Supply & Processing
Low-Relaxation 7-Wire Strand · 1860 MPa Grade · Bridge & Precast Supply
Source ASTM Grade 270 prestressing strand for your bridge, precast and post-tensioning orders. Specify diameter, minimum breaking force, coil quantity and destination to receive a quotation prepared for your project.
Check Grade 270 diameters ↓Specify the prestressing strand grade, nominal diameter and required testing documents to match your precast plant or engineering project.
| Grade | ASTM Grade 270 [1860] |
| Material standard | ASTM A416/A416M-26 |
| Product construction | Seven wires, one core and six outer helical wires (1×7) |
| Surface | Uncoated high-carbon steel strand |
| Relaxation class | Low-relaxation, as specified |
| Minimum tensile strength | 270 ksi [1860 MPa], based on nominal steel area |
| Nominal diameters | Refer to Grade 270 size table; supply confirmed by purchase order |
| Supply form | Reel or reelless coil, with packaging and identification agreed by order |
| Testing | Breaking force, yield/extension, elongation and relaxation per specified edition |
| Purchase details | Diameter, total length or MT, reel mass, testing and destination port |
Minimum grade tensile strength based on the nominal steel area.
Six outer steel wires wound around one central wire.
Specify testing and acceptance to the agreed ASTM edition.
Compare standard Grade 270 nominal diameters, steel areas and minimum breaking forces, then confirm the selected size and test scope for your order.
| Nominal diameter (mm) | Nominal steel area (mm²) | Min. breaking force (kN) | Reference mass (kg/1000 m) |
|---|---|---|---|
| 9.53 | 54.8 | 102.3 | 432 |
| 11.11 | 74.2 | 137.9 | 582 |
| 12.70 | 98.7 | 183.7 | 775 |
| 15.24 | 140.0 | 260.7 | 1102 |
| 17.78 | 189.7 | 353.2 | 1487 |
Reference dimensional and breaking-force data are drawn from published ASTM A416 Grade 270 tables. Values and acceptance conditions for your order follow the specified ASTM A416/A416M-26 edition and the supplied test documentation. Diameter entries are reference options rather than a confirmation of stock.
Send one size list with the quantity and reel packing for each diameter.
Check the 1×7 construction, actual wire geometry and coil condition to support your incoming material inspection.
The cut end shows the single core and six helical outer wires used in a 1×7 prestressing strand.
Confirm strand diameter, outer-wire lay, surface condition and coil size in the material specification.
Plan your acceptance testing by strand grade, nominal diameter and the relevant load and relaxation requirements.
| Parameter | Reference requirement | Basis |
|---|---|---|
| Grade 270 [1860] | 1860 MPa / 270 ksi | Based on nominal steel area |
| Total elongation | ≥ 3.5% | Gauge length and procedure to specified method |
| Low-relaxation loss, 1000 h at 70% load | ≤ 2.5% | Based on specified minimum breaking force |
| Low-relaxation loss, 1000 h at 80% load | ≤ 3.5% | Based on specified minimum breaking force |
Reference relaxation and elongation acceptance comes from published ASTM A416 technical provisions. Confirm requirements and testing in the ASTM A416/A416M-26 edition specified by your contract.
Review the key manufacturing controls behind seven-wire prestressing strand. Include final mechanical acceptance and reel requirements in your purchase specification.
Wire drawing and controlled stranding produce the required 1×7 geometry.
Continuous thermal-mechanical treatment develops the specified finished strand properties.
High-carbon wire rod is drawn to the required wire geometry and properties.
One core and six helically wound outer wires form the prestressing strand.
Treatment and testing confirm the required strand mechanical condition.
Prestressing strand is selected by the structural design and stressing system. Send your tendon schedule and project acceptance requirements for procurement.
Specify tendon material for precast girders and post-tensioned bridge structures according to the engineered system.
Supply Grade 270 strand for pretensioned beams, slabs and other prestressed concrete components.
Prestressing tendons for engineered bridge members.
Pretensioned units produced under precast plant specifications.
Strand matched to duct, anchor and stressing-system requirements.
Tendon material for specified precast concrete structures.
Include diameter, strand class, required breaking force and delivery schedule with your RFQ.
Source prestressing strand with clear purchasing conditions backed by company-wide manufacturing scale, documentation planning and export coordination.
Our actual annual steel production across product categories is 8 million metric tons, supporting repeat procurement planning.
Manufacturing ↗Our regular company-wide steel inventory reaches 1 million metric tons. Strand availability is confirmed against your exact diameter and quantity.
Steel Inventory ↗Specify the ASTM edition, breaking load, relaxation evidence, test certificates and reel traceability requirements.
Quality Control ↗Send coil or reel net mass, total required length, packing specifications and port to coordinate your quotation.
Contact Sales ↗Estimate the length of Grade 270 strand based on reference unit mass. Select the nominal diameter and enter your reel mass to plan shipment quantities.
Estimate uses published reference mass per 1,000 m for the nominal seven-wire strand size. Final reel length follows the actual net mass and material documentation.
Specify the acceptance tests and certificate details expected for your concrete project and receive confirmation with your purchase agreement.
Request breaking-force, yield/extension, elongation and relaxation evidence where applicable to your order.
Include your required reel length, net coil mass, lifting method and destination port. Packing arrangements can be coordinated around the agreed order and shipment plan.
Quote packing requirements together with strand length, grade and total weight.
Browse product families with different structures and intended uses. Match your material choice to the required grade and project design.
Grade 270 [1860] is a high-strength uncoated seven-wire strand grade under ASTM A416/A416M for prestressed concrete. The grade designation represents a minimum tensile strength of 270 ksi [1860 MPa].
Submit the nominal diameter listed in your drawing or tendon schedule. The size table shows reference Grade 270 diameters; current supply and minimum breaking force are confirmed against your order specification.
Low-relaxation strand is tested under the applicable ASTM conditions. Specify the standard edition and relaxation evidence needed for your project.
Yes. State your breaking-force test, elongation, inspection certificate, net reel weight, pack type and destination in the RFQ so the required scope can be confirmed.
Divide the net mass in kilograms by the nominal mass per metre for the selected seven-wire strand. The calculator uses published reference unit masses for initial planning.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.