 Round bar
The process starts from EAF. Analyzed by spectro analyser, the short stress production line, completed with reheating furnace with slide (without water cooling) and roller guides. The final product is of good quality, accurate size and good technical property, "all straightened and tagged, one end alighted and both ends ground" is the rule in commercial management.
1.quality standard, grade and other items
Description |
Grade |
Size |
Standard |
BS round bar |
G250 |
dia.12-40mm |
BS4449:1988 |
Plain carbon round bar |
Q215,Q235 |
dia.12-40mm |
GB700-88 |
Qualified carbon round bar |
S20C,S45C |
dia.12-130mm |
JIS G4051 |
Chromium bearing steel round bar |
GCr15,GCr15SiMn |
dia.12-85mm |
YB9-68 |
Hot rolled quality carbon structural round bar |
10#-70# |
dia.12-130mm |
GB699-88 |
Hot rolled alloy structural round bar |
15Mn-70Mn, 20Mn2~50Mn2, 20Mn V, 27SiMn,
15Cr~50Cr, 20Mn VB, 15CrMo-42CrMo,
20CrMnMo, 20CrNiMo, 20CrMnSi, 45MnB
|
dia.12-130mm |
GB3077-88 |
2. steel bar for chains
Class |
Grade |
Chemical Composition (%) |
C (max) |
Mn |
Si |
P (max) |
S (max) |
1 |
M15 |
0.18 |
0.40-0.60 |
0.05 max |
0.040 |
0.040 |
2 |
M20Mn |
0.24 |
1.10-1.60 |
0.20-0.55 |
0.040 |
0.040 |
3 |
M30Mn2 |
0.36 |
1.30-1.80 |
0.20-0.55 |
0.040 |
0.040 |
3. Hot rolled quality carbon structural round bar
Class |
Chemical Composition (%) |
C |
Si |
Mn |
max |
P |
S |
Ni |
Cr |
Cu |
10 |
0.07-0.014 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.15 |
0.25 |
15 |
0.12-0.19 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
20 |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
25 |
0.22-0.30 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
30 |
0.27-0.35 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
35 |
0.32-0.40 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
40 |
0.37-0.45 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
45 |
0.42-0.50 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
Steel Grade: 40Cr/M20Mn/M30Mn2/20CrMnTiH/GCr15/GCr15SiMn/S20C-S45C
4. Hot rolled alloy structural round bar
Item |
Grade |
Chemical Composition (%) |
C |
Si |
Mn |
Mo |
Cr |
Mn |
20Mn2 |
0.17-0.24 |
0.17-0.37 |
1.40-1.80 |
-- |
-- |
Cr |
40Cr |
0.37-0.44 |
0.17-0.37 |
0.50-0.80 |
-- |
0.80-1.10 |
CrMo |
15CrMo |
0.12-0.18 |
0.17-0.37 |
0.40-0.70 |
0.40-0.55 |
0.80-1.10 |
|
