ILJIN GLOBAL TECH. CENTER
SUMMARY OF MATERIAL SPECIFICATION FOR QUOTATION ONLY
SUBJECT : Hot Rolled Bar of High Carbon Chromium Bearing Steel(SUJ2R) For Forging MS-310-001-1
2
MS-310-002-1 shall be as follow
Max
10ppm
Max
30ppm
0.98
~1.05
0.25
~0.40
Max
0.025
(8S is Annealling)
STEEL TYPE OF SYMBOL
Manufacturing Process Bars shall be made from Blast(Electric furnace) melted steel that is killed, vaccum degassed,
continuously cast into bloom and hot rolled. The reduction ratio must be greater than 4S
SUJ2R(SAE52100)
(mm)
Decarburization
(mm)
Straightness
±1.0%
1.0% of Outer Dia.
0 to + 100mm
Tolerance
0.20 max.
0.30 max.
Magnetic flux leakage inspection (or equivalent) shall be performed on 100% of the bars in
1mm / 1m and 3mm / total length
Non-Metallic Inclusions
O.D
Out-of-Round
Length
Coarse-carbide and C-segregation measured per SEP1520 shall be as follow (CN5.7/CZ6.3/CZ7.4)
Conversion No. of Macro-streak flaws(for each layer)
There shall be no macro-streak flaws exceeding 4.0mm in length
Macro-streak Flaw No.
Hardenablility
Macrostructure
Chemical Composition
Macro-streak Flows
per JIS Z 2344
Caibide Segregation
Surface Defects and
Decarburization
Item
Dimensions MS-310-002-1 Shall be as follow (unit.mm)
Magnetic Flux
Leakage Inspection
≤42
>42 ≤60
>60 ≤80
>80 ≤105
0.40 max.
0.60 max.
0.30 max.
0.40 max.
0.60 max.
0.80 max.
1
2 C Si Mn P S Cu Ni Cr Mo [O] Ti
3
4
5
Class. A B C D
Thin 2. 5↓2. 0↓1.0↓1.5↓
Heavy 1. 5↓1. 0↓1.0↓1.5↓
6
1 2 3
>0.5 >1.0 >2.0
≤1.0 ≤2.0 ≤3.0
<3.0 <0.7 <0.5
7
8
9 Mechnical Properties The Mechnical Properties of the Round Bar
EL(%)
15↑
15↑
10
11
12
13
SAE1055 390↑650↑183~241 800~850℃
Air cooling.℃
S55CR 390↑650↑183~241 800~850℃
Materials Y.S(Mpa) T.S(Mpa) Hardness.HB
Max
30ppm
Length of macro-streak flaws(mm)
Max
0.20
Max
0.20
0.10
~0.20
Max
0.08
0.15
~0.35
0.75
~0.90
Max
0.030
Max
0.015
ILJIN GLOBAL TECH. CENTER
SUMMARY OF MATERIAL SPECIFICATION FOR QUOTATION ONLY
SUBJECT : Hot Rolled Bar of Carbon Steel(S55CR) For Forging MS-310-002-1
Chemical Composition
Max
15ppm
3
The ideal critical diameter (D1) of the steel shall be 1.70 or greater. (At that time Order)
Per ASTM E381. Maximum limits are S1, R1, and C1.(Applies to billets)
be greater than 8s
STEEL TYPE OF SYMBOL
Manufacturing Process Bars shall be made from Blast(Electric furnace) melted steel that is killed, vaccum degassed,
continuously cast into bloom, hot rolled and subcritical annealed. The reduction ratio must
S55CR(SAE1055)
0.55
~0.58
Magnetic flux leakage inspection (or equivalent) shall be performed on 100% of the bars in
each production lot.
Maxium decarburization as measured per ASTM E 1077 shall be as follows
Diameter
Range(mm)
Surface Defect
(mm)
Decarburization
(mm)
Straightness
Tolerance
±1.0%
1.0% of Outer Dia.
Conversion No. of Macro-streak flaws(for each layer)
Decarburization
There shall be no macro-streak flaws exceeding 4.0mm in length
Macro-streak Flaw No.
ASTM E45A Method
Macro-streak Flows
per JIS Z 2344
Hardenablility
Macrostructure
Non-Metallic Inclusions
Surface Defects and
Grain size
Hardness
≤42
>42 ≤60
>60 ≤80
>80 ≤105
Leakage Inspection
Magnetic Flux
0 to + 100mm
Item
Dimensions Round bar Dimension (unit.mm)
0.40 max.
0.60 max.
1mm / 1m and 3mm / total length
O.D
Out-of-Round
Length
The hardness of the bar shall be HB 241 Max
Grain size 5.0 or Finer Than 5.0 (ASTM E112)
Chamfering & Labelling Two end of BAR should be chamfering and should attach TAG
0.30 max.
0.40 max.
0.60 max.
0.80 max.
0.20 max.
0.30 max.