PC Strand, Pre-stressed Concrete Metal Material-Internal Testing Plan and Traceability

Core Values

Metal Material-Internal Testing Plan & Traceability

Plastic Material Testing

Quality Control

Social Responsibity

1. Scope

The ITP is suitable for the quality control and inspection of 15.24 mm pc strand which is produced conforming to the standard GB/T5224-2014

2. Standards

GB/T5224-2014 Strand for Pre-stressed Concrete

GB/T24242.2 Non - alloy steel rods - Part 2: General purpose wire rods

GB/T 5223 Steel wire for Pre-stressed Concrete

GB/T24242.4 Non - alloy wire rods - Part 4: Special purpose wire rods

GB/T 21839 Experimental Method of Steel for Pre-stressed Concrete

YB/T 081 Numerical Correction of Metallurgical Technology Standard and Principle of Judgment of Detection

GB/T 24238 Hot-rolled wire rod for producing PC Wire and strand

3. Quality Control Point

Quality Control Point

4. Inspection and Experimental Plan

5.Typical Example of Traceability

File 1: Mechanical Property Test Record of Prestressed Steel Strand

Take PC Strand of Coil No. 217041898-5 as an example
The technical parameters of this coil are as follows:
Diameter: 15.19 mm
Breaking load: 266.3 kN
Non proportional extension force: 249.7kN
Strength grade: 1900 Mpa
Elongation: 5.4%
Straightness: 1 mm
Elastic modulus: 198
Lay Length: 230mm
This coil was produced on April 18, 2017 by production line 2 of South Workshop, and the model of testing machine is JEW-600
The person in charge of production of this coil is Zhang Ying
The person in charge of the test of this coil: Zhong Zhen
This coil is the fifth small coil divided by No.217041898 large coil.
(The above handwritten records shall be archived and sealed)
If there is a problem with this coil
The responsibility can be traced back to large coil of No.217041898,

Call out the data of No.217041898 large coil as follows, (see file: Production Record of Prestressed Steel Strand Stranding)
File 2: Production Record of Prestressed Steel Strand Stranding

The large coil No.217041898 is twisted by the following 7 reels of single wire,
Reel number/wire diameter/length
155/5.25/18250
81/5.08/18450
201/5.07/18450
98/5.07/18450
33/5.06/18450
207/5.08/18450
119/5.08/18450
Single wire blending operator: Xiong Huabo
Date: April 18, 2017

From the reel number and the date ,we can trace back to the detailed single wire producing record from April 16, 2017 to 2017 or April 17, 2017
(See File: Producing Record of wire drawing)
File 3: Producing Record of wire drawing dated April 17, 2017

Reel No.155 single steel wire
Measured wire diameter: 5.25
Measured length: 18250
File4: Producing Record of wire drawing dated April 16, 2017

Reel No.201 single steel wire
Measured wire diameter: 5.07
Reel No.98 single steel wire
Measured wire diameter: 5.07
Reel No.81 single steel wire
Measured wire diameter: 5.08
File5: Producing Record of wire drawing dated April 16, 2017

Reel No.33 single steel wire
Measured wire diameter: 5.06
Reel No.119 single steel wire
Measured wire diameter: 5.08
Reel No.207 single steel wire
Measured wire diameter: 5.08

From Producing Record of wire drawing,we can trace back to the mechanical property test record of single wire
(see file: Mechanical property test record of single wire)
File 6: Mechanical property test record of single wire

Reel No.155
Measured value of tension test
Total breaking load: 4260N
Tensile strength: 1983 Mpa
Surface quality: acceptable
Elongation: 39%
Bending: 7
File 7: Mechanical property test record of single wire

Reel No.201
Measured value of tension test
Total breaking load: 3900N
Tensile strength: 1987Mpa
Surface quality: acceptable
Elongation: 37%
Bending: 9

Reel No. 98
Measured value of tension test
Total breaking load: 3900N
Tensile strength: 1987Mpa
Surface quality: acceptable
Elongation: 37%
Bending: 9
File 8: Mechanical property test record of single wire

Reel No.81
Measured value of tension test
Total breaking load: 3960N
Tensile strength: 1978Mpa
Surface quality: acceptable
Elongation: 39%
Bending: 8

Reel No.207
Measured value of tension test
Total breaking load: 3880N
Tensile strength: 1961Mpa
Surface quality: acceptable
Elongation: 39%
Bending: 10

Reel No.119
Measured value of tension test
Total breaking load: 3880N
Tensile strength: 1961Mpa
Surface quality: acceptable
Elongation: 37%
Bending: 10
File 9: Mechanical property test record of single wire

Reel No.33
Measured value of tension test
Total breaking load: 3820N
Tensile strength: 1946Mpa
Surface quality: acceptable
Elongation: 37%
Bending: 10

According to the heat number 7C-02402B recorded on Steel wire mechanical property test record above, the condition of used wire rods can be traced,
Call out the operation record of pickling and phosphating of all wire rods, as shown below:,
(See file :Operation record of wire rods pickling and phosphating)
File 10: Operation record of wire rods pickling and phosphating

According to the heat number 7C-02402B recorded on Steel wire mechanical property test record above, raw material inspection and acceptance records can be traced,
(See file:Raw material inspection and acceptance records)
File 11: Raw material inspection and acceptance records

According to the heat number 7C-02402B recorded on Steel wire mechanical property test record above, Raw Material Products Quality Certificate can be traced,
(See file:Raw Material Products Quality Certificate)
File 12: Raw Material Products Quality Certificate