2. DESCRIPTION:
AISI 4140 is a medium carbon, chromium and molybdenum alloy steel.
The normal condition is hardened
and tempered to a range of 850 to 1000 Mpa ultimate tensile
strength for bar sizes up to 220mm
diameter. Limited ruling sections may apply according to Australian
Standards
3. APPLICATIONS:
AISI 4140 is an ideal general purpose high tensile constructional
steel ready for use after machining. It is
used for shafts, axles, studs & bolts, large gears and light duty
form rolls. The steel is suitable for
induction or flame hardening.
4. TYPICAL CHEMICAL ANALYSIS:
BS 708M40 ALLOY STEEL ROUND BAR
| Carbon | Silicon | Manganese | Chromium | Nickel | Molybdenum | Phosphorus | Sulfur |
| 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.20 | / | 0.15-0.25 | 0.035 max | 0.035 max |
Note:The figures are based on the data of 42CrMo, according to
Chinese Standard GB-T 699-1999
Chemical compositions can be adjusted as your requirements with a
MOQ of 300MTs.
5. HEAT TREATMENT CONDITION AND MECHANICAL PROPERTIES:
BS 708M40 ALLOY STEEL ROUND BAR
| Heat Treatment | Mechanical Properties | Hardness |
| Normalizing | Quenching | Tempering | Tensile
Strength
(Mpa) | Yield Point (Mpa) | Elongation (%) | Reduction of are (%) | Impact Absorbing Energy (J) | Before Heat Treatment (HB) |
| Celsius Degree | MIN | MAX |
| / | 850 | 550 | 1080 | 930 | 12 | 45 | 63 | 217 |
6. SIZE RANGE:
Diameter:10-350mm
Length:200-1300mm(cut as your requirement)
PACKAGE AND DELIVERY:
Seaworthy package or as your requirments;
10-25 days after confirmed.
CERTIFICATE OF QUALITY :
Issued in English , in addition the normal terms, production
process, the mechanical property (yield strength,tensile strength,
elongation and hardness. forged ratio, UT test result,Grain size,
heat treatment methods and the sample of is shown on the
certificate of quality.
MARKING :
Heat no will be cold stamped and steel grade, diameter
(mm)length(mm) and the manufacture Logo and weight(KG) is painted.
