The commonly used metal material brand representation method commonly used for the sign of metal materials (two)
Example and explanation of the method of indicating the brand of steel products
- the name of the pig iron grade indicates that the number of the raw iron grades is expressed in the symbols specified in Table 1 and the number of Arabia figures.
The A, Arabia figures indicate an average of silicon content (by a few thousandths).
For example, the cast iron with a silicon content of 2.75% to 3.25% is expressed as "Z 30".
The iron containing 0.85% ~ 1.25% silicon is made of steel. The brand name is "L 10".
B, vanadium bearing pig iron and decarburization of low phosphorus iron, Arabia figures respectively indicate the average content of vanadium and carbon (all by a few thousandth).
For example, the vanadium pig iron containing vanadium is not less than 0.40%, its brand name is "F 40", and the carbon content of 1.20% to 1.60% steel is decarbonization and low phosphorus granulated iron, its brand is "TL 14".
- the expression of carbon structural steel and low alloy high strength structure is usually divided into two categories: general purpose steel and special steel.
A and general structural steel use the phonetic alphabet "Q", which represents the yield point. The value of the yield point (MPa), the quality grade, the deoxidization method, and other symbols, make up the grades in order. For example: carbon junction
The number of steel structure is expressed as: Q235AF, Q235BZ; the sign of low alloy and high strength structural steel
Q 345C, Q345D. In the grades of carbon structural steel, the symbol "Z" and "special TZ" can be omitted, for example, the quality grades are C and D.
Q235 steel, its brand name should be Q235CZ and Q235DTZ, but can be omitted as Q 235C and
Q235D. The low alloy and high strength structural steel is composed of sedation steel and special sedation steel, but the end of the brand is not written to indicate the symbol of the deoxidization method.
B, special structural steel generally represent the symbol "Q", yield point value and symbol for product use, which represent the yield point of the steel. For example, the steel brand of pressure vessel is expressed as "Q345R", and the weathering steel brand is Q340NH.
C, according to the needs of the general high strength low alloy structural steel grades can also use two bit digital Arabia (in very few dollars average carbon content) and symbol standard; special high strength low alloy structural steel grades, besides the general composition, there should be written by representatives of product use symbols the provisions in 1.
- quality of quality carbon structural steel and high quality carbon spring steel
The high quality carbon structural steel is made up of two Arabia numerals (expressed in terms of average carbon content by tens of thousands) or Arabia numerals and element symbols and prescribed symbols.
A, rimmed steel and semi - sedation steel, respectively, at the end of the brand, respectively added "F" and "B". For example, the boiling steel with an average carbon content of 0.08% is expressed as "08F", and the semi killed steel with an average carbon content of 0.10% is named "10B".
B (S, P, steel were generally not less than 0.035%) symbol. For example, the average carbon content of 0.45% of the sedation steel, its brand name is "45".
C, high manganese content high quality carbon structural steel, with the average carbon content of the Arabia number after adding manganese symbol. For example, the average carbon content is 0.50%, the manganese content is 0.70% ~ 1% steel, its brand name is "50Mn".
D, senior high quality carbon steel (S, P = 0.030%), and the symbol "A in grades after". example
Such as: the average carbon content of 0.45% high quality carbon structural steel, its brand is "45A".
Super - high quality carbon steel (S = 0.020%, P = 0.025%), after the trademark symbol "E".
For example, a special grade carbon steel with an average carbon content of 0.45% is a grade of "45E".
The method for designation of the quality carbon spring steel brand is the same as the quality carbon structural steel brand designation (65, 70, 85, 65Mn steel in GB/T1222 and GB/T699 two standards simultaneously).
