T/JSGT 004-2025 Active Group standards

T/JSGT 004-2025 Hot rolled control nitrogen and vanadium containing steel bars for reinforced concrete

Publish Date: 2025-10-01 Implement Date: 2025-10-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/JSGT 004-2025

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Generally, it refers to microsurgical instruments

ICS Name: \nSteel rods and steel bars

Publish Date: 2025-10-01

Implement Date: 2025-10-01

Scope

This document specifies the rolling process, chemical composition, weight deviation, mechanical properties, grain size, metallographic structure, connection performance, and surface markings of hot-rolled steel bars for nitrogen-controlled vanadium-containing reinforced concrete. This document is applicable to hot-rolled steel bars for nitrogen-controlled vanadium-containing reinforced concrete with a nominal diameter range of 10 mm to 32 mm. 1. Additions: GB/T 223.17 "Determination of Titanium Content in Iron and Steel Alloys by Anthrone Methane Photometry"; GB/T 223.84 "Determination of Titanium Content in Iron and Steel Alloys by Anthrone Methane Spectrophotometry"; 2. The nominal cross-sectional area and theoretical unit weight of reinforcing bars shall comply with the provisions of Table 2 of GB 1499.2-2024. The allowable deviation between the actual weight and the theoretical weight shall comply with the provisions of Table 2. 10~12mm, -3.0~-5.5%; 14~20mm, -2.0~-4.5%; 22~32mm, -1.0~-3.5%; 3. GB/T 1499.2-2018 has been amended to GB 1499.2-2024; 4. Grain size: The actual grain size of hot-rolled steel bars for nitrogen-controlled vanadium-containing reinforced concrete shall be grade 9 or finer. If the supplier can guarantee, the grain size inspection may be waived. 5. Clause 7.4.1: When measuring the weight deviation of reinforcing bars, the samples shall be cut from different reinforcing bars, with the number of samples being 5, and the length of each sample not less than 500 mm. The length shall be measured one by one, with an accuracy of 1 mm. When measuring the total weight of the samples, the accuracy shall be 1 g; 6. Clause 8.3.2.1: Reinforcing bars shall be inspected and accepted in batches, each batch consisting of reinforcing bars of the same grade, the same furnace number, and the same specification. Clause 8.3.2.2: It is allowed to roll mixed batches composed of different furnace numbers of the same grade, the same smelting method, and the sam