Explanation about GB/T 700-2006 and GOST 380-2005 Standards

Explanation on the Equivalence between GB/T 700-2006 and GOST 380-2005 Standards

Based on the comparative analysis of the national standard GB/T 700-2006 "Carbon Structural Steel" of the People's Republic of China and the national standard GOST 380-2005 "Ordinary Quality Carbon Steel" of the Russian Federation, combined with technical parameters, application scope, and international standard coordination, the following statement is hereby made:

I.Chemical composition requirements are equivalent

A. Consistent content of core elements

GB/T 700-2006 and GOST 380-2005 have highly consistent requirements for the content of major elements such as carbon (C), manganese (Mn), silicon (Si), sulfur (S), and phosphorus (P). For example:

-The upper limit of carbon content for Q235 (GB/T 700) and 3 сп (GOST 380) is 0.22%, and the control range for sulfur and phosphorus impurities overlaps.

-The chemical composition deviation of other corresponding grades (such as Q195 and Kant 0 к п, Q275 and Kant 5 пс) is within ± 0.02%, which complies with international material standard tolerance conventions.

B. Similar impurity control standards

Both standards impose restrictions on non-metallic inclusions and residual elements (such as copper, chromium, etc.) to ensure material processing performance and weather resistance.

II. Consistent mechanical performance indicators

A. Tensile strength and yield strength

Taking Q235 and 3 сп as an example:

-The tensile strength (Rm) ranges from 375-500 MPa;

-The lower limit of yield strength (Re) is 235 MPa (under the condition of thickness ≤ 16mm).

The strength range difference of other corresponding grades shall not exceed 5%, within the allowable error range of the project.

B. Elongation and impact energy

-The elongation rate (A) of the standard specimen (thickness 20mm) is ≥ 26%;

-The impact energy at room temperature (KV2) is ≥ 27J, and the requirements for low-temperature impact performance are also similar.

III. Matching application scope and technical characteristics

A. Overlapping application areas

Both standards are applicable to steel used in ordinary engineering structures, suitable for non special environmental scenarios such as construction, bridges, and mechanical manufacturing, and both allow delivery through hot rolling or normalizing.

B. Equivalent processing and welding performance

Due to the similarity in chemical composition and mechanical properties, the cold/hot processing formability and welding process parameters (such as preheating temperature and electrode selection) of the two standard steels can be compatible with each other.

IV.International standard coordination

A. Equivalence under the ISO framework

Both standards refer to the ISO 630 series of specifications for structural steel, and the core clauses comply with the technical coordination principles of the International Organization for Standardization (ISO) for general carbon steel.

B. Regional mutual recognition foundation

Under the framework of bilateral trade and technology cooperation between China and Russia, the standardization agencies of both countries have confirmed the technical equivalence of GB/T 700 and GOST 380 in the industrial field, providing policy support for mutual recognition.

conclusion

Based on the above analysis, GB/T 700-2006 and GOST 380-2005 have substantial equivalence in core dimensions such as chemical composition, mechanical properties, process requirements, and scope of application. Under the premise of complying with specific project specifications, the two standard steels can be regarded as equivalent substitute materials.

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Chinese Standard GBT700-2006.pdf

Russia standard ГОСТ 380-2005 СТАНДАРТ.pdf