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WSC-300 Microcomputer-Controlled Steel Strand Stress Relaxation Testing Machine

The WSC-300 microcomputer-controlled steel strand stress relaxation testing machine employs servo control technology and computer-based data acquisition and processing, enabling closed-loop control and automated testing. It comprises four main components: the testing frame, the servo control system, the measurement and control system, and the test fixtures. With a maximum test force of 300 kN, the machine achieves an accuracy class better than 0.5.

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Specialized Testing Machine Series

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lbt@lbt.ltd

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+86-15102211717

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WSC-300 Microcomputer-Controlled Steel Strand Stress Relaxation Testing Machine

Description

Product Introduction:

The WSC‑300 microcomputer‑controlled steel strand stress relaxation testing machine employs servo‑control technology and computer‑based data acquisition and processing, enabling closed‑loop control and automated testing. It is a high‑precision materials testing instrument comprising a testing frame, a servo control system, a measurement and control system, and test fixtures. Its maximum test force is 300 kN, and its accuracy class exceeds Grade 0.5. This testing machine and its accessories comply with the following standards: GB/T 10120‑2013 “Metallic Materials — Tensile Stress Relaxation Test Method”; GB/T 5224‑2014 “Steel Strands for Prestressed Concrete”; GB/T 5223.3‑“Steel Bars for Prestressed Concrete”; GB/T 21839‑“Test Methods for Steel Used in Prestressed Concrete”; ISO 15630‑3:2010 “Steel for Concrete Reinforcement and Prestressing — Test Methods — Part 3: Steel for Prestressing”; ISO 6934‑4: “Steel for Prestressed Concrete — Part 4: Steel Strands”; EN 10391: “Metallic Materials — Tensile Stress Relaxation Test — Part 1: Test Procedure”; ASTM E328‑2013 “Standard Test Method for Stress Relaxation of Materials and Structural Components”; and JIS Z2276‑2012 “Test Method for Tensile Stress Relaxation of Metallic Materials.”

Technical Specifications:

Project	Parameter
Maximum range	300KN
Level	Class 0.5
Relative error of the indicated value	±1%
Measurement range	2%–100%F·S (no range divisions across the full scale)
Gauge length for relaxation and deformation of steel strands	100–1000mm
Gauge length of steel strand	≥60 times the nominal diameter of the steel strand
Relaxation lead screw stroke	0–100mm
Specimen length	≥2450mm
Working hours	≥1000h
Application of Relaxation Load to Steel Strand	Continuous loading, constant-rate loading, constant load, strain-controlled loading
Nominal diameter of steel strand	Φ9.50/Φ11.10/Φ12.70/Φ15.20
Overall dimensions of the machine	2730×540×1180mm
Input power supply	380V±10V/50Hz
Total machine power	3kW
Overall machine weight	900kg

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FAQs

Do you supply full-set testing instruments for asphalt and geotechnical engineering projects?

We offer complete lab solutions including asphalt viscosity tester, asphalt rutting tester, geotextile permeability tester, low-temperature flexibility tester and concrete/cement test equipment, covering raw material detection for road, water conservancy and construction engineering projects

Can you customize fixtures or test machines based on our special test requirements? How about after-sales service and warranty?

We provide non-standard customization of test equipment and customized fixture clamps according to customers’ specimen size and test standards. All our testing machines enjoy 12-month factory warranty; overseas customers get remote online debugging guidance, spare parts supply and technical operation training. Our products have been exported to over 70 countries globally

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Customer Reviews

European Plastic Pipe Manufacturer｜Purchase: Ring Stiffness & Hydrostatic Burst Tester

From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

2026.06.05

★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

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WSC-300 Microcomputer-Controlled Steel Strand Stress Relaxation Testing Machine

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