This standard is formulated in accordance with the provisions of GB/T 1.3-1997 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 3: Regulations for the Preparation of Product Standards". This standard specifies the requirements, test methods, inspection rules and markings, packaging, transportation and storage of polyvinyl chloride (PVC) doors and windows reinforced steel. This standard applies to reinforced steel produced by cold forming using cold-rolled steel strip on a continuous roller cold bending unit; it also applies to reinforced steel that has a high-frequency welding process added during this processing. It does not apply to reinforced steel produced by drawing, stamping, bending, etc. JG/T 131-2000 Polyvinyl chloride (PVC) doors and windows reinforced steel JG/T131-2000 Standard download decompression password: www.bzxz.net

JG/T131—2000
This standard is formulated in accordance with the provisions of GB/T1.3-1997 "Guidelines for Standardization Work Unit 1: Drafting and Expression Rules for Standardization Product Standards". This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the Technical Committee for Standardization of Building Products and Components of the Ministry of Construction. Part 3:
The drafting units of this standard are: China Building Metal Structure Association, Baoding Demas Building Materials Co., Ltd., Dalian Shide Plastic Industry Co., Ltd., Hebei Shengli Group Chenguang Machinery Factory, Shandong Luhong Plastic Window Machinery Group Corporation. The main drafters of this standard are: Liu Xuqiong, Wang Cunji, Wang Ying, Cheng Fengjie, Liu Yanqing, Jing Fengshang. This standard is entrusted to the Plastic Door and Window Committee of the China Building Metal Structure Association for interpretation. 213
Construction Industry Standard of the People's Republic of China Polyvinyl chloride (PVC) Door and Window Reinforcement Steel
Reinforcement steel of rigid polyvinyl chloride window and door1 Scope
JG/T 131--2000
This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of polyvinyl chloride (PVC) door and window reinforcement steel (hereinafter referred to as reinforcement steel).
This standard is applicable to reinforcement steel produced by cold forming with cold rolled steel strip on continuous roller cold bending machine; it is also applicable to reinforcement steel with high frequency welding process added in this processing. It is not applicable to reinforcement steel produced by drawing, stamping, bending, etc.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the most recent versions of the following standards. GB/T716-1991 Cold-rolled steel strip of carbon structural steel GB/T2518-1988 Continuously hot-dip galvanized steel sheets and strips GB/T11253-1989 Cold-rolled steel sheets and strips of carbon structural steel and low alloy structural steel QB/T3826-1999 Test method for corrosion resistance of metal coatings and chemically treated layers of light industrial products Neutral salt spray test (NSS) method
QB/T3832-1999 Evaluation of corrosion test results of metal coatings on light industrial products 3 Requirements
3.1 Materials and surface treatment
3.1.1 When the reinforced steel is an open type, it shall be rolled with materials with mechanical properties not lower than those of Q235 steel strip specified in GB/T11253, and the inner and outer surfaces shall be cold-dip galvanized or directly rolled with hot-dip galvanized steel strip in GB/T2518-1988 (100-PT-ZLB-thickness×width).
3.1.2 When the reinforced steel is a closed type, it should be rolled with a steel strip material not lower than Q235 specified in GB/T11253, and the inner and outer surfaces should be hot-dip galvanized.
3.2 Appearance
3.2.1 The inner and outer surfaces of the reinforced steel are required to be flat, and cracks, delamination, and lap welding defects are not allowed. Indentations, scratches, roller marks, burns, grinding and burr removal marks with a depth not exceeding the negative deviation range allowed by the wall thickness are allowed. 3.2.2 For closed reinforced steel manufactured by high-frequency welding, the wall thickness at the weld is allowed to be thickened and the inner seam weld ribs exist. 3.2.3 The incision slope of the two ends of the reinforced steel should be less than 7°, the appearance should be flat, the edges and corners should be clear, and there should be no burrs. 3.3 Dimensional deviation
3.3.1 The thickness of the reinforced steel material should not be less than 1.2mm, and the material thickness tolerance should comply with the provisions of GB/T716. 3.3.2 The tolerance of the cross-section size of the reinforced steel is shown in Figure 1. 3.3.3 The inner corner radius of the reinforced steel bending R≤1.4t (t represents the wall thickness), as shown in Figure 1. Approved by the Ministry of Construction of the People's Republic of China on September 30, 2000 214
2000-12-01 implementation
JG/T131-2000
Figure 1 The inner corner radius of the reinforced steel bending Intent
3.3.4 The straightness of the reinforced steel is 1.5mm/m, the twist is not greater than 1°, and the angle deviation should not be greater than ±1.5°3.4 Corrosion resistance
The corrosion resistance should reach 48h8 level.
4 Test method
4.1 Appearance
Carry out visual inspection under natural light at a distance of 400~500mm from the test piece. 4.2 Sectional dimensions
Measure with a caliper with an accuracy of 0.02mm at a distance of not less than 200mm from both end faces of the reinforced steel. 4.3 Material thickness
Measure with a caliper with an accuracy of 0.02mm at a distance of not less than 10mm from the end face of the reinforced steel. Ho
4.4 Straightness
Cut a 1m section of the reinforced steel and place it on a Class III platform to measure with a feeler gauge, or use a 1m ruler against the reinforced steel to measure the gap with a feeler gauge.
4.5 Inner corner radius
Use a radius gauge to measure the inner corner radius R at the distance from the end face of the reinforced steel. 4.6 Angular deviation
Use a universal angle gauge to measure the angular deviation of the reinforced steel at a distance of 200mm from the end face of the reinforced steel. 4.7 Twist degree
Put the reinforced steel on the platform and stabilize it by its own weight. Measure the maximum distance N between the bottom surface of the reinforced steel and the platform along the length direction of the reinforced steel (as shown in Figure 2). The value after deducting the bending at this point from the N value is the twist degree. Figure 2 Schematic diagram of twist degree test
Twist degree is divided into grades according to the diameter of the circumscribed circle of the profile, and is expressed in millimeters of twist allowed per millimeter of profile width. For profiles with a nominal length of less than or equal to 6m, the twist degree shall comply with the provisions of Table 1. For profiles with a length of more than 6m, the twist degree shall be agreed upon by the supply and demand parties.
Circumscribed circle diameter
>12.5～40
>40~80
>80～250
JG/T131—2000
Twist degree per meter length
(mm/mm width)
Not more than
Total length
Example: The circumscribed circle diameter of the reinforced steel is 68mm, and the width is 46mm. The N value of the steel is 3mm and the bending value is 1mm in the length of 1m. Then the twist value is 1mm, and the twist value of the steel per millimeter width is: 2/46=0.043mm. According to Table 1, the allowable twist value of the steel is 0.052mm, that is, the actual twist value is less than the maximum allowable twist value, which is qualified. Similarly, the twist degree over the entire length is determined in the same way. 4.8 Corrosion resistance
Corrosion resistance test shall be carried out in accordance with the provisions of QB/T3826, and the assessment shall be carried out in accordance with QB/T3832. 5 Inspection rules
Product inspection is divided into factory inspection and type inspection. Products can only be shipped after passing the inspection and attaching the product certificate. 5.1 Factory inspectionWww.bzxZ.net
5.1.1 Factory inspection shall be carried out within the validity period of the type inspection. 5.1.2 Factory inspection shall be carried out in accordance with GB/T2828. Sampling shall adopt the normal inspection one-time sampling plan, the inspection level is II, and the qualified quality level AQL value shall be as specified in Table 2.
Table 2 Factory Inspection Sampling Table
5.2 Type Inspection
Inspection Items
Dimension Deviation
Standard Clauses
5.2.1 Type inspection shall be conducted in any of the following cases: a) Test and finalization of new products or old products for transfer to factory production; Unqualified Category
b) After formal production, when there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, inspection shall be conducted once a year; d) When the product is discontinued for more than one year and then resumed; e) When there is a major difference between the factory inspection result and the last type inspection result; f) When the national quality supervision agency or the contract requires type inspection. AQL
5.2.2 Type inspection shall be conducted in accordance with GB/T2829. Sampling shall adopt the normal inspection one-time sampling plan, the discrimination level shall be Level II, and the unqualified quality level RQL value and inspection items shall be as specified in Table 3. Table 3 Type inspection sampling table
Inspection items
Corrosion resistance
Standard clauses
Unqualified categories
6 Marking, packaging, transportation and storage
6.1 Marking
6.1.1 Products should have trademarks or factory names
JG/T131—2000
6.1.2 Product packaging should be marked with product name, model or mark, trademark, grade, quantity, quality, volume, factory date, factory name. 6.2 Packaging
6.2.1 Reinforced steel is generally delivered in bundles, and each bundle should consist of reinforced steel of the same model and specification. 6.2.2 The reinforced steel ends should be placed neatly and tied firmly with steel strips, low-carbon steel wires or rolling hoops. The length should not exceed 7m and should be tied 3 times. The distance between the first place and the neat end should not exceed 1m.
6.3 Transportation
The products should be protected from impact, extrusion, rain and moisture during transportation. 6.4 Storage
6.4.1 The products should be stored in a warehouse with no corrosive media, good air circulation and relative humidity less than 85%. 6.4.2 When stacking the products, there should be cork with a thickness of not less than 100mm under the stack, with a spacing of not more than 500mm and a stacking height of not more than 0.5m.
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