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Introduction to te GB Standard Designation System :: Total Materia Article
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Introduction to te GB Standard Designation System
Te 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 te PRC have designations that begin with "GB". GB is an abbreviation of Guojia Biaozhun, meaning "national standard".
GB standards are te Chinese national standards issued by te Standardization Administration of China (SAC), te Chinese National Committee of te ISO and te IEC. All character set standards that originate in te 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"). Te remainder of te Standard designation is constructed from a numerical code which follows "GB" or "GB/T".
Te 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.
Te GB designations for non-alloy common steels and HSLA steels use te præfiks letter Q, followed by te 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 te 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 te descriptive code with chemical symbols, followed by its average content. If te average content is less than 1.5%, it is indicated only with te 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 te præfiks letter T, followed by numeric codes, which represent te average carbon content to a multiple of 10. For example, T8 means te steel contains an average carbon content of about 0.80%. When te average carbon content is more than 1.0% in alloy tool steels, te steel grade would not indicate te carbon content in te standard designation. For example:
CrMn steel containing 1.30–1.50% C, 1.30–1.60% Cr, 0.45–0.75% Mn,
9Mn2V steel containing 0.85–0.95% C, 1.70–2.00% Mn, 0.10 to 0.25% V.
Te descriptive method for te alloy element is te same in alloy structural steels.
Carbon content is not indicated in high-speed steels, and only uses te descriptive code with chemical symbols, followed by te 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 te carbon content to a multiple of ten, followed by te chemical symbols of te alloy elements with their content in stainless steels and heat-resistant steels, If te present alloys are microalloy elements te designation only shows te chemical symbols.
steel 9Cr18MoV contains 0.85–0.95% C, 17–19% Cr, 0.0–1.3% Mo, 0.07–0.12% V.
If te carbon content is less than 0.03 or 0.08%, 00 or 0 would be used for te steel designations, respectively, e.g. 00Cr18Ni10 and 0Cr13.
Te following is a list of some National Standards of te People's Republic of China.
Click on te link to see a list of GB Standard List covering te following material categories:
Structural and Constructional Steels
Welding and Filler materials
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Finding GB materials and standards from specific designation systems in te Total Materia database
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For example, you can review all metal standards from GB by selecting this SDO from te popup.
Te result list consists of over 1300 GB metal standards. Information includes: standard description, year of last issue, current status (valid, replaced, etc.) and a hot link to te materials defined by this standard.
By simply clicking te materials hot link, you can see a list of metal materials defined by te selected standard.
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