Introduction to the GB Standard Designation System

요약:

The group of Chinese (GB) standard specifications covers iron and carbon and alloy steel within different delivery conditions such as plates, strips, shits, bars, wires, castings, forgings etc. All character set standards that originate in the PRC have designations that begin with "GB". GB is an abbreviation of Guojia Biaozhun, meaning "national standard".

GB standards are the Chinese national standards issued by the Standardization Administration of China (SAC), the Chinese National Committee of the ISO and the IEC. All character set standards that originate in the PRC have designations that begin with "GB". GB is an abbreviation of Guojia Biaozhun, meaning "national standard". Recommended steel standards are prefixed "GB/T" (T from Chinese language ?? or tuijian, which translates as "recommended"). The remainder of the Standard designation is constructed from a numerical code which follows "GB" or "GB/T".

The group of Chinese (GB) standard specifications covers iron and carbon and alloy steel within different delivery conditions such as plates, strips, shits, bars, wires, castings, forgings etc.

The GB designations for non-alloy common steels and HSLA steels use the prefix letter Q, followed by the yield strength value (MPa). For example, Q235, Q345, Q390 denote non-alloy common steels and HSLA steels with a yield strength of 235, 345, and 390 MPa, respectively. Non-alloy structural steels and alloy structural steels are represented by numerical codes, which represent the average carbon content to a multiple of 100. For example, numeric code 45 shows a steel containing 0.45% C. Alloy elements in steel use the descriptive code with chemical symbols, followed by its average content. If the average content is less than 1.5%, it is indicated only with the chemical symbol, for example :

34CrNi3Mo containing 0.30–0.40% C, 0.70–1.10% Cr, 2.75–3.25% Ni, and 0.25–0.40% Mo.

Non-alloy tool steels are represented by the prefix letter T, followed by numeric codes, which represent the average carbon content to a multiple of 10. For example, T8 means the steel contains an average carbon content of about 0.80%. When the average carbon content is more than 1.0% in alloy tool steels, the steel grade would not indicate the carbon content in the standard designation. For example:

CrMn steel containing 1.30–1.50% C, 1.30–1.60% Cr, 0.45–0.75% Mn,
or
9Mn2V steel containing 0.85–0.95% C, 1.70–2.00% Mn, 0.10 to 0.25% V.

The descriptive method for the alloy element is the same in alloy structural steels.

Carbon content is not indicated in high-speed steels, and only uses the descriptive code with chemical symbols, followed by the alloy element content. For example:

Tungsten high speed steel 18-4-1 (T1) is represented by W18Cr4V

W–Mo high-speed steel 6-5-4-2 (M2) is represented by W6Mo5Cr4V2.

They are represented by a numeric code, which represents the carbon content to a multiple of ten, followed by the chemical symbols of the alloy elements with their content in stainless steels and heat-resistant steels, If the present alloys are microalloy elements the designation only shows the chemical symbols.

For example:

steel 9Cr18MoV contains 0.85–0.95% C, 17–19% Cr, 0.0–1.3% Mo, 0.07–0.12% V.

If the carbon content is less than 0.03 or 0.08%, 00 or 0 would be used for the steel designations, respectively, e.g. 00Cr18Ni10 and 0Cr13.

The following is a list of some National Standards of the People's Republic of China.


Click on the link to see a list of GB Standard List covering the following material categories:

  • Irons
  • Structural and Constructional Steels
  • Stainless Steels
  • Castings
  • Welding and Filler materials

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요약

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시작하시려면, 메뉴 표시줄의 규격 리스트 버튼을 클릭합니다.


단순히 표준 개발 기구(SDO)를 선택하거나 표준 번호 또는 키워드를 입력하시기만 하면, 30,000 이상의 규격과 다국어 데이터베이스에서 즉각적으로 결과를 받을 수 있습니다.

예를 들어, 팝업에서 이 SDO를 선택하여 GB에 있는 모든 금속 규격을 검토할 수 있습니다.


결과 목록은 1300개의 재질, GB개의 금속 규격으로 구성되어 있습니다. 포함 정보: 규격 설명, 마지막 발행 해, 현재의 상태 (유효, 교체 등), 및 규격에 의해 정의된 재질들의 핫 링크로 구성되어 있습니다.


단순히 재질의 링크를 클릭하시면, 선택한 규격에 의해 정의된 금속 재질의 목록을 볼 수 있습니다.


재질의 목록에서, 각 재질의 자세한 특성과 등가물을 검토하실 수 있습니다.


Total Materia 데이터베이스를 사용해 보실 수 있는 기회가 있습니다. 저희는 Total Materia 무료 체험을 통해 150,000명 이상의 사용자가 이용하고 있는 커뮤니티로 귀하를 초대합니다.