Path: Home > GB/T > Page419 > GB/T 20065-2025 Home > Standard_List > GB/T > Page419 > GB/T 20065-2025 GB/T 20065-2025 PDF English
GB/T 20065: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20065-2025 | English | 305 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Screw-thread steel bars for the prestressing of concrete
| Valid |
| GB/T 20065-2016 | English | 140 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Screw-thread steel bars for the prestressing of concrete
| Valid |
| GB/T 20065-2006 | English | 70 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Screw-thread steel bars for the prestressing of concrete
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 20065-2025
GB/T 20065-2025: Screw-thread steel bars for the prestressing of concrete---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20065-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.15
CCS H 44
Replacing GB/T 20065-2016, GB/T 33279-2017
Screw-Thread Steel Bars for the Prestressing of Concrete
Issued on: AUGUST 29, 2025
Implemented on: MARCH 1, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 7
4 Classification and Designation... 7
5 Ordering Contents... 8
6 Manufacturing Process... 8
7 Technical Requirements... 9
8 Test Methods... 15
9 Inspection Rules... 19
10 Packaging, Marking, and Quality Certificates... 21
Appendix A (Normative) Characteristic Value Inspection Rules... 22
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document replaced GB/T 20065-2016 Screw-Thread Steel Bars for the Prestressing of
Concrete, and GB/T 33279-2017 Ribbed Bars for Track Panel. This Document is mainly based
on GB/T 20065-2016, integrating the contents of GB/T 33279-2017.Compared with GB/T
20065-2016, the major technical changes of this Document are as follows besides the structural
adjustments and editorial modifications.
--- Add the classification of steel bars (see 4.1 of this Edition);
--- Change the maximum total elongation, Agt, of finishing rolling screw-thread steel bars
for prestressing (see 7.2.1 of this Edition; 7.4.1 of GB/T 20065-2016);
--- Change the non-metallic inclusion rating requirements for finishing rolling screw-thread
steel bars for prestressing of Grade PSB1080 and above (see 7.5 of this Edition; 7.5 of
GB/T 20065-2016);
--- Change the recommended nominal diameter of finishing rolling screw-thread steel bars
for prestressing (see 7.7.1 of this Edition; 6.1 of GB/T 20065-2016);
--- Add 28 mm, 34 mm, 38 mm, and 42 mm specifications of finishing rolling screw-thread
steel bars for prestressing (see 7.7.2 of this Edition);
--- Change the weight and permissible deviations (see 7.7.6 of this Edition; 6.7 of GB/T
20065-2016);
--- Change the tensile test method for finishing rolling screw-thread steel bars for
prestressing (see 8.1 of this Editon; 8.1 of GB/T 20065-2016);
--- Add the reverse bending test method for finishing rolling screw-thread steel bars for track
panels (see 8.4 of this Edition);
--- Change the dimensional measurement requirements (see 8.6 of this Edition; 8.5 of GB/T
20065-2016).
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China Iron and Steel Association.
This Document shall be under the jurisdiction of National Technical Committee on Steel of
Standardization Administration of China (SAC/TC 183).
Screw-Thread Steel Bars for the Prestressing of Concrete
1 Scope
This Document specifies the classification, designations, ordering contents, manufacturing
processes, technical requirements, inspection rules, packaging, marking, and quality certificate
of screw-thread steel bars for the prestressing of concrete (hereinafter referred to as steel bars);
and describes the corresponding test methods.
This Document applies to finishing rolling screw-thread steel bars for prestressing concrete
(hereinafter referred to as finishing rolling screw-thread steel bars for prestressing) produced
using processes such as hot rolling, post-rolling residual heat treatment, or heat treatment; and
to finishing rolling screw-thread steel bars for track panels produced using hot rolling processes.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 222 Steels and alloys - Permissible deviations of product analyzed chemical
composition
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content
- Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration
or potentiometric titration method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate
separation-diphenyl carbazide photometric method for the determination of chromium
content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoyl-N-
phenylhydroxylamine extraction photometric method for the determination of vanadium
content
GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane photometric method for the determination of titanium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproine-
chloroform extraction photometric method for the determination of copper
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The
thiocyanate spectrophotometric method
GB/T 223.37 Iron, steel and alloy - Determination of nitrogen content - Indophenol blue
spectrophotometric method after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content - The
sulphochlorophenol S spectrophotometric method
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth
phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate
blue spectrophotometric method
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium
(potassium) periodate photometric method for the determination of manganese content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate
titration method after combustion in the pipe furnace for the determination of sulfur
content
GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-volumetric
method after combustion in the pipe furnace
GB/T 223.83 Iron, steel and alloy - Determination of high sulfur content - Infrared
absorption method after combustion in an induction furnace
GB/T 223.84 Iron, steel and alloy - Determination of titanium content -
Diantipyrylmethane spectrophotometric method
GB/T 223.86 Iron, steel and alloy - Determination of total carbon content - Infrared
absorption method after combustion in an induction furnace
GB/T 2101 General requirement of acceptance, packaging, marking and certification for
section steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark
discharge atomic emission spectrometric method (routine method)
GB/T 14370 Anchorage, grip and coupler for prestressing tendons
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination
of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared
absorption method after combustion in an induction furnace (routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively
coupled plasma atomic emission spectrometric method
GB/T 21839 Test methods of steel for prestressing concrete
GB/T 28900 Test methods of steel for reinforcement of concrete
GB/T 38937 Steel for the reinforcement of concrete vocabulary
YB/T 081 Rule for rounding off of numerical values and judgement of testing values for
technical standards of metallurgy
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 38937 and the
following apply.
3.1 Finishing rolling screw-thread steel bars
A hot-rolled straight steel bar with discontinuous external threads, which can be connected or
anchored at any cross-section using a connector or anchor with matching internal threads.
3.2 Nominal circle area
The cross-sectional area of the steel bar excluding threads.
3.3 Coefficient of efficiency section
The ratio of the nominal circle area of a steel bar to its theoretical circle area (including the
cross-sectional area of the thread).
4 Classification and Designation
4.1 Classification
The screw-thread steel bars for prestressing concrete are classified into two categories. finishing
rolling screw-thread steel bars for prestressing and finishing rolling screw-thread steel bars for
track panels. The finishing rolling screw-thread steel bars for prestressing are used as
prestressing tendons in prestressed concrete structures; while finishing rolling screw-thread
steel bars for track panels are used as non-prestressing tendons in prestressed concrete track
panels.
4.2 Designation
The composition and meaning of steel bar designations are shown in Table 1.According to the
purchaser's requirements, the designations with other strength levels of finishing rolling screw-
thread steel bars for track panels can be provided beyond those listed in Table 1.
5 Ordering Contents
Contracts for orders placed according to this Document shall include at least the following.
a) This Document number;
b) Product name;
c) Designation;
d) Specifications and weight (or quantity);
e) Special requirements.
6 Manufacturing Process
6.1 Smelting Method
Steel shall be smelted in a converter or electric arc furnace and shall be performed out-of-
furnace refining.
6.2 Delivery condition and delivery type
6.2.1 Finishing rolling screw-thread steel bars for prestressing shall be delivered in straight bars
in hot-rolled condition, post-rolled residual heat-treated condition, or heat-treated condition.
6.2.2 Finishing rolling screw-thread steel bars for track panels shall be delivered in straight bars
in hot-rolled condition.
7 Technical Requirements
7.1 Chemical composition
7.1.1 Chemical composition (smelting analysis) of finishing rolling screw-thread steel bars for
prestressing. Phosphorus and sulfur content shall not exceed 0.035%. The manufacturer shall
select appropriate chemical compositions and alloying elements to ensure that finished steel
bars produced through different processes meet the mechanical property requirements specified
in 7.2.
7.1.2 The chemical composition (smelting analysis) and carbon equivalent of finishing rolling
screw-thread steel bars for track panels shall conform to the specifications in Table 2.V, Nb, Ti,
and other elements may be added to the steel as needed.
7.1.3 The permissible deviation of the chemical composition of the finished steel bars shall
comply with the provisions of GB/T 222.
7.1.4 The permissible deviation of the carbon equivalent Ceq of finishing rolling screw-thread
steel bars for track panels is +0.02%.
7.2 Mechanical properties
7.2.1 The characteristic values of mechanical properties of steel bars, such as lower yield
strength ReL, tensile strength Rm, elongation after fracture A, and total elongation at maximum
force Agt, shall comply with the provisions of Table 3.Table 3 lists the characteristic values of
various mechanical properties, with stress relaxation performance being the maximum
guaranteed value and the others being the minimum guaranteed values.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Price & DeliveryUS$305.00 · In stock · Download in 9 secondsGB/T 20065-2025: Screw-thread steel bars for the prestressing of concrete Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 20065-2025 be delivered?Answer: The full copy PDF of English version of GB/T 20065-2025 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 20065-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 20065-2025_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 20065-2025 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 20065-2025?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 20065-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 20065-2025?A step-by-step guide to download PDF of GB/T 20065-2025_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 20065-2025".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|