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Seamless 40Cr

Seamless 40Cr

product description: 40cr
40cr seamless steel tube, alloy tube. Chemical composition and mechanical properties of
: composition: silicon 0.17~0.37%, MN 0.5~0.8, chromium 0.8~1.1%
tempering: specimen diameter: 25mm,850-heating oil-quenching, 520 degrees after tempering: tensile strength 1000 MPA, yield of 800 MPA, extension 9%, section contracted 45%, impact toughness 588,300 kJ/m2.
for its manufacturing process, is divided into hot-rolled (squeeze) seamless steel tubes and drawing (rolling) seamless steel pipe in two ways. Drawing (rolling) tubes consists of a circular tube and shaped tubes in two.

hot-rolled (squeeze seamless steel tubes): round tube perforation → → → heated three-roll cross rolling, continuous rolled or extruded-cannula → sizing (or reducing) steel tube straightening → → → → cooling water pressure test (or testing) → tags → storage.
cold drawing (rolling) seamless steel pipe: round tube perforated → heat → → → → start → annealing pickling oil (copper) → multi-pass drawing (cold rolled) steel tube heat treatment straightening → → → → hydrostatic test (testing) → tags → storage.
alloy steel: a. low alloy steel (alloy element content ≤ 5%) b. alloy (alloying element content >5~10%) c. high alloy steel (alloy element content >10%
specification for normalizing: normalizing temperature 850-870 ° c, quenching hardness 179-229HBS.
moppet softened cold pressure specifications: temperature 740~760℃, time 4~6h, 50~100℃/h cooling rate, with the furnace down to temperatures ≤ 600, released air cooled. former hardness ≤ 217HBS, hardness ≤ 163HBS.
health iron protection swing WISP specification
(670 ± 10) ℃ x2h, with furnace warming, (710 ± 10) ℃ x2h, with furnace cooling, (670 ± 10) ℃ x2h, with furnace warming, (710 ± 10) ℃ x2h, again with furnace cooling, (670 ± 10) ℃ x2h, with furnace warming, (710 ± 10) ℃ x2h, Furnace cooling, a total of 3 cycles and then cooling to 550 c, due to air cooling. Hardness 153HBS after treatment.
tempering specification: quenching temperature 850 ± 10 ° c, oil-cooled; tempering temperature 520 ± 10 ° c, water and oil cooling. [1] 

 

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