author:cst    time:2023-07-27

Where can bolt tensile testing be done? Are there any reliable third-party bolt testing organizations?

Bolt tensile testing can be done at China Steel Inspection (中钢国检). China Steel Inspection is a reliable third-party testing organization, a state-owned inspection unit with qualifications to issue testing reports. If you need to test bolts, you can contact us.

Bolt Tensile Testing and Report

Bolt Tensile Testing Report

Sample: Foundation bolt

Specifications: M56x1860

Other sample information: Grade: 35#

Number of samples: 2 pieces

Project name: Wind power project

Project location: Western area, collector line tower foundation

Testing category: Commissioned testing

Testing basis: 1. GB/T 228.1-2021 "Metal Materials - Tensile Testing - Part 1: Room Temperature Test Method"

Criteria: GB/T 699-2015 "Quality Carbon Structural Steels"

Testing items: 1. Elongation after fracture, 2. Tensile strength, 3. Lower yield strength, 4. Reduction of area.

Metal Material Tensile Testing Parameters and Principles

Metal material tensile testing includes: Upper yield strength determination, lower yield strength determination, specified plastic elongation strength determination, specified total elongation strength determination, verification and determination of specified residual elongation strength, yield point elongation ratio determination, maximum force plastic elongation ratio determination, maximum force total elongation ratio determination, fracture total elongation ratio determination, elongation after fracture determination, and reduction of area determination.

The principle of tensile testing is to apply tensile force to the test specimen until it fractures, and measure one or more mechanical properties.

Unless otherwise specified, the test should be conducted at room temperature between 10°C and 35°C. For laboratories that do not meet the above temperature requirements, the laboratory should evaluate the impact of such environmental conditions on the test results and/or calibration data. When the test and calibration activities exceed the temperature range of 10°C to 35°C, the temperature should be recorded and reported. If there is a significant temperature gradient during the test and/or calibration process, the measurement uncertainty may increase and deviations may occur.

For tests that require strict temperature control, the test temperature should be 23°C ± 5°C.

Third-Party Bolt Testing Organization

China Steel Inspection is a professional third-party bolt testing organization. It is a national metal product quality supervision and inspection center approved by the state, and has CMA, CNAS, ILAC, and CAL testing qualifications. It is also a member of the National Fastener Standardization Technical Committee. Its testing reports are recognized nationwide and can be used as export certificates.

 Bolt Sample Image

We can test various types of bolts, including wind power high-strength bolts, friction type high-strength bolts, foundation bolts, torsional-shear type high-strength bolts, hexagon head high-strength bolts, 8.8s steel structure high-strength bolts, U-bolts, L-bolts, etc.

Regarding bolt testing items, we can conduct tensile testing, impact testing, pendulum impact testing, fatigue testing, tensile strength testing, elongation after fracture testing, reduction of area testing, tensile load testing, Vickers hardness testing, Rockwell hardness testing, nut proof load testing, coefficient of friction testing for mating pairs, etc.

If you need bolt tensile testing or a third-party bolt testing organization, please feel free to contact us at China Steel Inspection.

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