GB/T 20065-2025 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20065-2025	RFQ	ASK	3 days	Screw-thread steel bars for the prestressing of concrete	Valid
GB/T 20065-2016	140	Add to Cart	Auto, < 3 mins	Screw-thread steel bars for the prestressing of concrete	Valid
GB/T 20065-2006	70	Add to Cart	Auto, < 3 mins	Screw-thread steel bars for the prestressing of concrete	Obsolete

Basic data

Standard ID: GB/T 20065-2025 (GB/T20065-2025)
Description (Translated English): Screw-thread steel bars for the prestressing of concrete
Sector / Industry: National Standard (Recommended)
Date of Implementation: 2026-03-01
Older Standard (superseded by this standard): GB/T 20065-2016, GB/T 33279-2017

GB/T 20065-2016: Screw-thread steel bars for the prestressing of concrete

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Screw-thread steel bars for the prestressing of concrete ICS 77.140.60 H44 National Standards of People's Republic of China Replacing GB/T 20065-2006 Prestressed concrete rebar Published 2016-12-13 2017-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China issued

Foreword

This standard was drafted in accordance with rules GB/T 1.1-2009 given. Instead of the standard GB/T 20065-2006 "prestressed concrete steel screw" This standard GB/T 20065-2006 compared main To technical content changes as follows. --- increasing the nominal diameter; --- increased demand for chemical elements; --- increasing the intensity level; --- relaxation test methods were unified; --- fatigue test is described in detail. This standard method using Reference redrafted ISO 6934-5.1991 "Steel for prestressed concrete - Part 5. with or without post- Reasonable hot rolled bars "preparation, and ISO 6934-5.1991 is non-equivalent degree of consistency. This standard 6934-5 ISO .1991 main differences are. --- This standard threaded steel profile, international standards. surface may be plain or ribbed; --- different intensity levels divided, this increases the yield strength of the standard 785 and 1150 steel; --- different nominal diameter range, the present standard 15mm ~ 75mm, the international standard 15mm ~ 40mm. The standard proposed by China Iron and Steel Association. This standard by the National Steel Standardization Technical Committee (SAC/TC183). Drafted by. China Metallurgical Construction Research Institute Co., Ltd., Tianjin rolling two-day iron Steel Co., Tianjin Iron and Steel Group Co. The company, Shandong Shiheng Group Co., Ltd., Fujian Sanming Iron and Steel (Group) Co., Ltd., Wuhu Xinxing Ductile Iron Pipes Co., Ltd., Shougang Corporation, Metallurgical Industry Information Standards Institute. The main drafters. Zhu Jianguo, Shi Guoming, Chen Xin, a Li Ping, Wang Changsheng, Liu Jianfeng, Guo Haichang, Kang Di whole, Wang Yujie, Zhao Yingjie, Han Ziguang, Wang Jian, Xiao Lijun, Liu gem, Song Hongwei, Wang era. This standard supersedes the previous editions are. --- GB/T 20065-2006. Prestressed concrete rebar

1 Scope

This standard specifies the prestressed concrete steel screw (also called finishing rebar, steel hereinafter) terms and definitions, strength Level code, size, shape, weight and tolerance, technical requirements, test methods, inspection rules, packaging, labeling, quality certificate. This standard applies to hot rolled, prestressed concrete production process like heat treatment or heat treatment after rolling with rebar.

2 Normative references

The following documents for the application of this document is essential. For dated references, only applies to the version dated paper Pieces. For undated references, the latest edition (including any amendments) applies to this document. Chemical composition of the finished GB/T 222 steel tolerance GB /Determination of soluble silicon steel and total silicon content T 223.5 reduced silicon molybdate salt spectrophotometric Determination of steel and alloy chromium content GB/T 223.11 visual titration or potentiometric titration GB/T 223.12 steel and alloy analysis carbonate separation - by diphenyl hydrazide spectrophotometric determination of chromium content GB/T 223.14 steel and tantalum alloys - reagent extraction and spectrophotometric determination of vanadium content GB/T 223.16 steel and alloys - Determination of Ti amount chromotropic acid GB/T 223.19 steel and alloy analysis neocuproine - chloroform extraction and spectrophotometric determination of copper content GB/T 223.23 alloy steel and nickel content measured spectrophotometrically dimethylglyoxime GB/T 223.26 thiocyanate salt spectrophotometric determination of molybdenum content alloy steel and GB/T 223.37 steel and alloy analysis distillation - indophenol blue spectrophotometric determination of nitrogen GB/T 223.40 Determination of the contents of alloy steel and niobium sulphochlorophenol S Spectrophotometry GB/T 223.59 phosphorus content of steel and alloy measured by bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method GB/T 223.63 steel and alloys - sodium periodate (K) for Determination of the amount of Determination of sulfur content potassium iodate titration method after GB/T 223.68 and alloy steel pipe furnace combustion GB/T 223.69 after the carbon content and alloy steel measuring tube furnace combustion gas volumetric method After GB/T 223.83 alloy steel and high sulfur content measured induction furnace combustion infrared absorption method After the determination of total carbon content and alloy steel GB/T 223.86 induction furnace combustion infrared absorption method General provisions GB/T 2101 steel acceptance, packaging, marking and quality certificate GB/T 3075 Metal Material Testing method for controlling an axial force GB/T 4336 carbon steel and low alloy steel for spark discharge atomic emission spectrometric method (conventional method) 10561 nonmetallic inclusions in steel content GB/T measurement standard rating FIG microscopic test method GB/T 14370 prestressing tendon anchorage, and the connector clip GB/T 17505 Steel and steel products General technical delivery requirements GB/T 20066 Steel and iron chemical composition of the sample and the measurement sample preparation methods GB/T 20123 total carbon and sulfur content of steel an induction furnace combustion infrared absorption method (conventional method) Multi-element content of the low alloy steel 20125 GB/T measured by inductively coupled plasma atomic emission spectrometry GB/T 21839 Test Method for prestressed concrete steel GB/T 28900 Test Method for steel reinforced concrete And the sensed value is determined rounding value YB/T 081 standard metallurgical techniques

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Rebar screw-threadsteelbars It is a hot rolled steel threaded into straight bars with discontinuous external thread, at any cross section of the steel, and can be used with a matching shape Shaped inner threaded connector or anchor connected or anchored. 3.2 Nominal cross-sectional area nominalcirclearea Free sectional area of the reinforcement threads. 3.3 Effective section factor coefficientofefficiencysection Reinforced nominal sectional area to the cross-sectional area (cross-sectional area including the thread) ratio.

4 strength class code

Prestressed concrete steel screw yield strength of the division level, code-named "PSB" represented by adding a predetermined minimum yield strength. P, S, B are the first letter of the English Prestressing, Screw, Bars of. For example. PSB830 represents the minimum value of the yield strength The steel 830MPa.

5 Order content

According to the standard contract orders should include at least the following. a) standard number; b) the product name; c) Product strength class code; d) Size and weight (or number); e) Special requirements. 6 size, shape, weight and tolerance 6.1 nominal diameter range and recommended diameter Reinforced nominal diameter in the range of 15mm ~ 75mm, the present reinforced standard recommended nominal diameter 25mm, 32mm. According to Users require reinforced other specifications. 6.2 Nominal sectional area to weight Reinforced nominal sectional area to weight are shown in Table 1. 6.3 non-reinforced threaded shape with longitudinal ribs on both sides of steel and the thread on the same helix, the shape as shown in FIG. A steel surface and cross-sectional shape of FIG. 6.4 Reinforced dimensions and tolerances should meet the requirements in Table 2. NOTE. base width tolerance thread design parameters belonging to the rolls. 6.5 Length and tolerance 6.5.1 steel is usually delivered by length, specific length of delivery should be specified in the contract. Length can be requested on demand sawing reprocessing. 6.5.2 reinforced by length or multiple length delivery, the length tolerance is 0mm ~ 20mm. 6.6 bending and end portions 6.6.1 curvature shall not affect the normal use of steel, steel per meter curvature not greater than 4mm, the total curvature no greater than the overall length of steel 0.4%. 6.6.2 reinforced end portion should be even, without prejudice to the connector. Weight and tolerance 6.7 6.7.1 Delivery reinforced by the actual weight or theoretical weight. ± 4% by weight of the theoretical reinforcement 6.7.2 tolerances and actual weight should be less than the theoretical weight specified in Table 1.

7 Technical Requirements

7.1 Chemical composition 7.1.1 chemical composition of the steel, the sulfur and phosphorus content of not more than 0.035%, the manufacturer should select the chemical composition and the alloying elements, in order to ensure Through different methods of processing the finished steel to meet Table 3 requirements specified mechanical properties. 7.1.2 finished steel chemical composition should meet the requirements of tolerance GB/T 222 a. 7.2 smelting method In oxygen steel converter or electric furnace smelting. 7.3 Delivery status Hot-rolled steel to a state, heat treatment after rolling or heat treatment delivery state press straight. 7.4 Mechanical Properties 7.4.1 mechanical properties of steel shall conform to Table 3. When no clear yield a place with a non-proportional extension strength (RP0.2). 7.4.2 If no special requirements, only the initial force relaxation test was of 70% Fm, allows estimation method to determine relaxation test 120h 1000h relaxation rate. 7.4.3 elongation type usually selected A, after agreement between manufacturer, can also be used Agt. 7.4.4 supply and demand sides through consultation, can fatigue tests. 7.5 Non-metallic inclusions For inquiry, by mutual agreement, PSB1080 level and above can be reinforced non-metallic inclusions testing, various types of inclusions together Grid level should be no higher than 2.0, respectively. 7.6 surface quality 7.6.1 steel surface may not have transverse cracks, scarring and folding. 7.6.2 allows not affect the mechanical properties of steel and other defects connection.

8 Test Methods

8.1 Test items Each batch of steel test items, the number of samples, sampling methods and test methods shall be as specified in Table 4. 2 2 Tensile optionally two steel 8.2, GB/T 28900 3 a 1000t1 optionally a slack reinforced every 8.3, GB/T 21839 4 each 1000t1 a fatigue optionally a reinforcement 8.4, GB/T 3075 5 a nonmetallic inclusions optionally a reinforced GB/T 10561 6 by support surface - visual 7 6.7 weight deviation 8.2 Tensile test 8.2.1 Tensile test should be reinforced with full sectional dimension samples. Allowed by machining to reduce the cross section of the sample. 8.2.2 stress determination unit in accordance with Table 1 set forth in said cross-sectional area is well calculated. Measurement of Appendix A. 8.2.3 Agt 8.2.4 batch weight of greater than steel 60t, 60t excess of, each additional 40T, increasing a tensile test specimen. 8.3 Relaxation Test 8.3.1 Experimental stress relaxation properties of the steel should be GB/T 21839 performed. 8.3.2 During the test, the ambient temperature of the sample should be kept within 20 ℃ ± 2 ℃. 8.3.3 nominal diameter in the range of 15mm ~ 40mm, and the specimen gauge length is not less than 60 times the nominal diameter; nominal diameter Within the range of 50mm ~ 75mm, the specimen gauge length is not less than 2500mm. Shall perform any heat treatment after cold working and the sample preparation 8.3.4. 8.3.5 1000h allows estimated values of relaxation test with the data of at least 120h. 8.4 Fatigue Test 8.4.1 Fatigue tests should be taken directly on the finished steel sample, sample length should ensure that the distance between the two clamps is not less than 500mm. 8.4.2 reinforcement should be able to withstand 0.7Fm ~ 2 × 106 times after (0.7Fm-Fr) pulsating load without breaking, see formula (1). Fr/Sn = 195 (1) Where. Fm --- reinforced nominal maximum force, units of cattle (N); Fr --- stress range equivalent load value in units of bovine (N); Sn --- reinforced nominal cross-sectional area, expressed in square millimeters (mm2); 195 --- stress range, in megapascals (MPa). 8.4.3 fatigue test conducted in accordance with GB/T 21839's. Size Measurement 8.5 In addition to the reinforcement profile size measurement inspection, it should match the shape of the connector using precession test cases.

9 inspection rules

9.1 inspection and acceptance Reinforcement of inspection and acceptance by the supplier, buyer is entitled to be tested. 9.2 Batch rules Reinforced inspection and acceptance should be approved, each batch should be the same heat, the same specification steel, the same delivery status of composition, each batch is 60t. 9.3 Number of samples The number of samples in each test item should be reinforced in accordance with Table 4. 9.4 reinspection and determination Reinspection of steel and determination should be consistent with GB/T 17505 of. 9.5 rounding off Test results of rounding off with determination shall comply with YB/T 081's. 9.6 mechanical connection Reinforcement connection allows a screw type connector, finished steel manufacturer responsible demonstrate any point along the length of the steel reinforcement are cut It may be connected to any other steel length. The connector and anchor may be finished steel production plant to provide matching. Connectors and anchor should be consistent GB/T 14370 of the relevant provisions. 10 packaging, marking and certification Logo 10.1 reinforcement should meet the following requirements. a) reinforcing bar ends by coloring strength level, defined as follows. PSB785 not painted, PSB830 painted white, PSB930 painted yellow, PSB1080 painted red, PSB1200 painted blue; b) steel plate flag hanging method can be employed, according to intensity level to reinforced PSB785, PSB830, PSB930, PSB1080, PSB1200 said diameter of several millimeters to Arabic numerals; c) signage content should be clear, tightly. 10.2 In addition to the above requirements, steel packaging, marking and certification shall comply with the relevant provisions of GB/T 2101's.

Appendix A

(Normative) Determination of maximum force reinforcement in the total elongation A.1 Sample A.1.1 length The minimum free length between the specimen grips should meet the requirements of Table A.1. Table A.1 millimeters Reinforced nominal minimum free length between the specimen grips diameter d≤25 350 25 \u003cd≤32 400 32 \u003cd≤50 500 50 \u003cd≤75 750 A.1.2 original gauge length of the marking and measuring The free length of the sample in the range of 5mm or 10mm evenly divided into equally spaced markers as segregated and should meet GB/T 28900 of the relevant requirements. A.2 Tensile Test Predetermined tensile test GB/T 28900, until the specimen breaks. A.3 measured after fracture Y and two selection markers V, the distance between these two marks before the tensile test should be at least 100mm. Two marks should be Clip located furthest away from the breaking point when the side. Two clamps away from the markers should not be less than 20mm or reinforced nominal diameter d (taken Both the larger person); the distance between the two marks with a breakpoint is not to be less than 50mm or 2d (whichever is the greater of the two). Figure A.1. Figure A.1 measured after fracture Total elongation Agt sample according to equation (A.1) is calculated under the most vigorous action. --- the distance L shown in FIG A.1 after fracture, in millimeters (mm); The distance between the same numerals before the L0 --- test, in millimeters (mm); Rm --- tensile strength, in megapascals (MPa); --- elastic modulus E, which is taken as equal to 2 × 105, in megapascals (MPa). ......

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