Introduction to the GB Standard Designation System

概要:

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

ナレッジベース検索

検索したい語句を入力:

検索方法

全文一致
キーワード

前方一致
要約

Total Materiaデータベースで金属の規格、現在の状況、材料の定義内容を見るには一度クリックするだけで探せます。

Total Materia規格リストではで数秒以内に関連する材料特性詳細を探し同等材料の検索が可能になります。

まず、メニューバーの規格リストボタンをクリックします。


規格を選択するか規格番号を入力するだけで3万以上の規格が登録されている多言語データベースから直ちに結果を見る事が出来ます。

例えば、ポップアップからGB規格を選ぶとその規格の金属材料全てを見る事ができます。


結果のリストは1300材料GB金属材料規格より構成され、それらの情報としては: 規格の説明、最終発行年、現在の状況(有効か、入れ替えなど)で対応する規格により定義される材料のホットリンクを提供しております。


材料のホットリンクををクリックするだけで選ばれた規格により定義される材料のリストが表示されます。


このリストから特性の詳細、各々の材料の同等材料をが分かります。


Total Materiaデータベースをあなたにテスト評価を頂くために15万人以上の方が登録されている無料お試しコミュニティ-へ御招待致します。