The alloy structure steel of ⑤ special utility, steel grade coronal with (or suffixal) plant on behalf of this steel the symbol of utility. For example, steel of 30CrMnSi of riveting snail appropriative, steel grade expresses to be ML30CrMnSi.
6. Low alloy high strenth steel
The expression of ① steel grade method, basically mix alloy structure steel is identical.
② uses low alloy high strength to major steel, answer to indicate finally in steel grade. For example 16Mn steel, the special steel that is used at bridge is planted for“16Mnq ” , the special steel of car crossbeam is planted for“16MnL ” , the special steel of pressure vessel is planted for“16MnR ” .
7. Spring steel
Spring steel can divide spring steel of the element that it is carbon and alloy spring steel by chemical composition two kinds, its steel grade represents a means, former basically as identical as steel of structure of element of high grade carbon, latter basically as identical as alloy structure steel.
8. Scroll bearing steel
Coronal of ① steel grade with the letter“G ” , express scroll bearing steel kind.
The carbolic content of steel grade of steel of chromic bearing of ② tall carbon not line out, chromic content with thousand express. For example GCr15. The steel grade of cementite bearing steel represents a means, basically mix alloy structure steel is identical.
9. Add up to golden tool steel and steel of high speed tool
① adds up to the average carbon content of steel grade of golden tool steel≥1.0% when, not content of line out carbon; When ＜ of average carbon content 1.0% when, with thousand express. For example Cr12, CrWMn, 9SiCr, 3Cr2W8V.
The expression of content of the alloying element in ② steel method, basically as identical as alloy structure steel. But steel grade of inferior to chromic content alloy tool steel, itsChromic content with thousand express, expressing to be added before the number of content“0”, so that open it and common element content by distinction of hundred denotive method,come. For example Cr06.
The steel grade of steel of tool of ③ high speed is average not content of line out carbon, line out all sorts of alloying element are average hundred of content. For example the steel grade that tungsten is high-speed steel expresses to be“W18Cr4V ” . Steel grade coronal with the letter“C ” person, express prep above of its carbon content not coronal“The general steel grade of C ” .
10. Stainless steel and refractory steel
Content of the carbon in ① steel grade with thousand express. For example“2Cr 13”The average carbon content of steel is 0.2% ; If carbolic amount is contained in steel≤0.03% or≤0.08% person, the coronal parts before steel grade with“00”Reach“0”Express, for example 00Cr17Ni14Mo2, 0Cr18 Ni9.
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