SCM445 /50CrMo4/din 1.7228/4145 hot forged steel price per kg,
forged steel bar, Small MOQ
Applications
AISI 4145H MOD Steel is a chromium molybdenum alloy steel grade
widely used in the oil and gas sectors. Similar to AISI 4140 but
with a higher carbon content. AISI 4145H MOD Steel is more popular
in larger diameters due to its increased strength and
harden-ability. AISI 4145H MOD Steel is commonly supplied quenched
and tempered with a hardness of between 30 to 36HRc. AISI 4145H MOD
Steel is commonly used for a variety of applications in the oil and
gas sector. Used often for the manufacture of down hole drilling
tools such as drill collars. Other applications include gears,
shafts for hydraulic presses, rolls for paper mills, pump shafts
and tool holders.
Quality Standard
ASTM A29 Standard Specification for Steel Bars, Carbon and Alloy,
Hot-Wrought, General
API 7 Specification for Rotary Drill Stem Elements.
Chemical Composition (%)
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Cu(％) |
|---|
| 0.42～0.49 | 0.65 ~ 1.10 | 0.75 ~ 1.20 | ≤0.035 | ≤0.040 | 0.15～0.25 | 0.15 ~ 0.30 | ≤0.25 |
METALLURGICAL CONDITIONS
Grain Size: The austenitic grain size shall be 6-9 as defined in
ASTM E-112.
Process: EAF+LF+VOD+Forged+Heat Treatment(optional)
HEAT TREATMENT
Heat treatment temperatures, including rate of heating, cooling and
soaking times will vary due to factors such as the shape and size
of eachAISI 4145H MOD Steel component. Other considerations during
the heat treatment process include the type of furnace, quenching
medium and work piece transfer facilities. Please consult your heat
treatment provider for full guidance on heat treatment of AISI
4145H MOD Steel.
Annealing: Heat the steel slowly to 800-850°C and allow enough time
for the steel to be thoroughly heated. Cool slowly in the furnace
to 480°C followed by air cooling.
Stress Relieving: When parts are heavily machined, ground or
otherwise subject to cold work, stress relieving will be beneficial
prior to hardening.
Hardening: AISI 4145H MOD Steel is usually supplied ready heat
treated to 30-36HRc. If further heat treatment is required annealed
AISI 4145H MOD Steel should be heated slowly to 840-875°C and after
adequate soaking at this temperature quench in oil. Temper as soon
as the tools reach room temperature.
Tempering: Heat carefully to a suitable temperature selected by
reference to a tempering chart or table (usually between 550-700°C,
soak at the temperature for 2 hours per 25mm of ruling section,
then allow to cool in air. Tempering between 250-375°C is not
advised as tempering within this range will seriously reduce the
impact values of this steel.
SIZE RANGE:
Round:
Hot Forged: 80mm -1200mm
SURFACE FINISHES:
Black, Peeled (K12), Turned & Polished (H10, H11),
Test: Ultrasonic test according to SEP 1921-84
