② is right in steel main alloying element with hundred express, and …… of titanium, niobium, zirconium, nitrogen press afore-mentioned alloy structure steel to be opposite the expression of microalloy element methodological line out.
11. Welding rod steel
The coronal before its steel grade with the letter“H ” , in order to distinguish at other steel kind. For example stainless steel welding wire is“H2Cr 13”, can distinguish at stainless steel“2Cr 13”.
12. Electrician uses silicon steel
① steel grade is comprised by letter and number. DR of letter of steel grade head states electrician uses hot-rolling silicon steel, DW states electrician does not have orientaton silicon steel with cold rolling, DQ states electrician uses silicon steel of cold rolling orientaton.
The number after ② letter states iron caustic is worth (W/kg) 100 times.
Rear of ③ steel grade adds a letter“G ” person, express to examine below high frequency rate; Did not add“G ” person, express next examining to be 50 cycle in frequency.
For example the value of damage of iron of weight of the biggest unit when steel grade DW470 states electrician does not have product of orientaton silicon steel to be led in 50 conspicuous frequency with cold rolling is 4.7W/kg.
13. Electrician uses pure iron
① its brand by the letter“DT ” is comprised with the number, “DT ” states electrician uses pure iron, the number shows the suitable serial number of different name, for example DT3.
The alphabet that ② adds at the back of the number shows electromagnetism performance: A —— advanced, E —— fancy, C —— is super, for example DT 8A.
3, the share is new old steel grade contrasts
Steel of knot of 1, carbon is new, old standard steel grade contrasts.
Department of GB700-88 new standard consults use international standard ISO630 " structural steel " , and IOCT380 of the Russia before GB700-79 old standard basically consults, because this both steel grade states method and the technical requirement that set to place of each steel grade are not identical, contrast steel grade of new old standard as follows now.
GB700-88 standard
GB700-79 standard
Steel grade
Technical condition
Steel grade
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