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Bearing Steel Bar (52100): Crucible Steel Alloyed with Chromium
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18. Oktoba 2026NO
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Bearing Steel Bar (52100): Crucible Steel Alloyed with Chromium

52100 is the steel of ball bearings: about 1 % carbon and 1.5 % chromium (ASM). The standard, ASTM A295, allows 0.93–1.05 % carbon and 1.35–1.60 % chromium. Here crucible steel is melted with chromium and a little manganese, cast, forged to bar and annealed soft for working. Our method, not the factory one: factory 52100 is melted in an electric furnace and vacuum-degassed to meet the standard's limits on inclusions. A crucible melt can reach the composition, but only a lab test shows whether it is clean enough for bearings. The picture: our drawing, crucible to bar.
Juu
2 days

Maagizo

1

Weigh the charge

For 1 kg: 981.5 g crucible steel of about 1 % carbon, 15 g chromium and 3.5 g manganese (our figures; see the last step). Use steel whose analysis you know.

Vifaa kwa hatua hii:

Feleji ya kalibuFeleji ya kalibu981.5 g
Chuma cha KromiamuChuma cha Kromiamu15 g
ManganisiManganisi3.5 g

Zana zinazohitajika:

Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
2

Melt

Pack the steel, chromium and manganese in a covered clay crucible and melt it in the furnace. The alloy is fully liquid above 1450 °C.

Zana zinazohitajika:

Kaure ya Udongo Yenye KinaKaure ya Udongo Yenye Kina
Tanuru la matofaliTanuru la matofali
MivuoMivuo
Glavu za kulehemuGlavu za kulehemu
Aproni ya NgoziAproni ya Ngozi
Miwani ya usalamaMiwani ya usalama
3

Cast the ingot

Lift the crucible out with tongs and pour into a cast-iron ingot mould. Let it cool.

Zana zinazohitajika:

Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Kalibu ya kutupa madiniKalibu ya kutupa madini
Glavu za kulehemuGlavu za kulehemu
Aproni ya NgoziAproni ya Ngozi
Miwani ya usalamaMiwani ya usalama
4

Forge to bar

Heat the ingot to a cherry-red heat and no hotter, and draw it out on the anvil to a round or square bar. Reheat when the colour drops; never hammer it cold.

Vifaa kwa hatua hii:

MkaaMkaa1 as required

Zana zinazohitajika:

Fua ya mhunziFua ya mhunzi
FuaweFuawe
Nyundo kubwaNyundo kubwa
Nyundo yenye kichwa cha msalabaNyundo yenye kichwa cha msalaba
Koleo za mhunziKoleo za mhunzi
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Glavu za kulehemuGlavu za kulehemu
Aproni ya NgoziAproni ya Ngozi
Miwani ya usalamaMiwani ya usalama
5

Test the analysis

Drill clean chips from the bar and have a lab analyse carbon, chromium, manganese, silicon, phosphorus and sulphur. Keep the bar only if it is within 52100 limits.

Zana zinazohitajika:

Kekee cha mkonoKekee cha mkono
Mitungi ya kioo yenye vifunikoMitungi ya kioo yenye vifuniko
Miwani ya usalamaMiwani ya usalama
6

Anneal soft

In the oven, hold the bar at 793 °C (1460 °F) for 30 minutes, cool in the oven no faster than 500 °C an hour to 682 °C (1260 °F), then cool in air (Verhoeven's anneal).

Zana zinazohitajika:

Tanuri ya kutibu kwa jotoTanuri ya kutibu kwa joto
Themokapo yenye kionyeshiThemokapo yenye kionyeshi
Koleo za mhunziKoleo za mhunzi
Glavu za kulehemuGlavu za kulehemu
7

The charge

Inapakia daftari la Jupyter…

Vifaa

4
  • 1
    Feleji ya kalibu
    981.5 g
    Kishikilia Nafasi
  • 1
    Chuma cha Kromiamu
    15 g
    Kishikilia Nafasi
  • 1
    Manganisi
    3.5 g
    Kishikilia Nafasi
  • 4
    Mkaa
    1 as required
    Kishikilia Nafasi

Zana Zinazohitajika

19

Mchoro huu unatengeneza

Thumbnail
Kishikilia nafasi

Fimbo ya chuma cha beringi (52100)

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Blueprint zinazohusiana

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