4140 steel alloy round bar ASTM AISI 4140 steel alloy round bar machining

1.4140 steel alloy round bar product details
·keyword:4140 steel alloy round bar
·Usage:It is used to manufacture forgings that require higher strength and
larger quenched and tempered sections than 35CrMo steel, such as large gears
for locomotive traction, supercharger transmission gears, rear axles,
connecting rods and spring clips that are heavily loaded, and can also be used
for Drill pipe joints and fishing tools for oil wells below 2000m, and can be
used for molds of bending machines, etc.
· Other Steel Types:5140 /4140 / 4340 / 4142 / 15CrMo / 6150 / 38CrMoAI /
8620 .....
·Serve:OEM/ODM,Sample free and 24 hours online
·Delivery status:With heat treatment (normalized, annealed or high temperature
tempered) or without heat treatment Goods, the delivery status should be
specified in the contract

2.SAE 4140 Steel Equivalent Steel Grade 
China GB steel number 42CrMo, Germany DIN steel number 42CrMo4, Germany DIN
material number 1.7225, French NF standard 40CD4/42CD4, Japanese JIS standard
SCM440, British BS standard 708M40/708A42/709M40, American AISI/ASTM 4140,
American SAE 4140, American UNS Standard G41400
(4140 alloy structural steel, executive standard: ASTM A29/A29M-04)

3.AISI 4140 Chemical Composition
C:0.38-0.45 Si:0.17-0.37 S：≤0.035 P:≤0.035
Mn:0.50-0.80 Cr:0.90-1.20 Mo:0.15-0.25 Ni:≤0.30
Cu≤0.30

4.SAE AISI 4140 steel heat treatment
（1）Machinability
In the annealed condition, the alloyed tool steel 1.7225 has good machinability
（2）Training
DIN 1.7225 steel has high ductility. It can be shaped in the annealed state
using conventional techniques. More pressure or force is required to form
because it is tougher than plain carbon steels.
（3）Welding
Alloy steel 1.7225 can be welded with all advanced techniques. However, the
mechanical properties will be affected if it is welded in the heat treated
condition and post-weld heat treatment should be performed.
（4）Heat treatment
1.7225 tool steel is heated to 845°C (1550°F) and then oil quenched. Before
hardening, it can be normalized by long heating to 913 °C (1675 °F) and then
air cooling.
（5）Forge
It is forged at 926 to 1205 °C
（6）Hot working
4140 steel can be hot worked at 816 to 1038 °C (1500 to 1900 °F).
（7）Cold working
1.7225 steel can be cold worked in the annealed condition using conventional
methods.
（8）Glow
Heat it to 800 – 850 °C, hold until the temperature is uniform throughout the
section and cool in the kiln.
（9）Normalize
Heat the 1.7225 alloy steel to 870-900℃, hold until the temperature is uniform
throughout the section, soak for 10-15 minutes, and cool in still air.
（10）Cranking
DIN 1.7225 steel can be tempered at 205 to 649 °C (400 to 1200 °F) depending
on the desired hardness. The hardness of the steel can be increased if the
tempering temperature is lower. For example, a tensile strength of 225 ksi can
be achieved by annealing at 316 °C (600 °F), and a tensile strength of 130
ksi can be achieved by annealing at 538 °C (1000 °F).
（11）Hardening
Alloy steel according to DIN 1.7225 can be hardened by cold forming or heating
and quenching.

What is the application of 4140 steel?
AISI 4140 steel round bar is an alloy structural steel with good strength and
good comprehensive mechanical properties after heat treatment. It has good
manufacturability. The maximum operating temperature is 427°C. It is used to
manufacture forgings that require higher strength and larger quenched and
tempered section than 35CrMo steel, and can also be used to manufacture turbine
fasteners, tool bodies, dies, brake shoes, etc.

Dongguan Songshun Mould Steel Co., Ltd. is an Indusrtial and trading company
with 2 warehouses that manufactures good & high quality kinds of steels
starting from 2012. The company provides the customized products and OEM
service. What´s more, we keep the mass stock of over 20000 tons. In those
years, we offer a wide range of steels to our customers from all over the
world. And we enjoy high praise among them.

Contact us
Feel free to contact us,we are glad to serve for you.
Songshun Always Open the Door for You.
MiKi Zhuo
Skype/Whatsapp/Wechat:+86-18269260283
A , DD:No.4 Dongda Street, Shatou, Changan Town, Dongguan City, Guangdong
Province, P.R.C China
For more 4140 steel product information, please click this link:
https://steelpurchase.com/4140-scm440-172 , 25-steel/
songshunsteel41404340

Minimum Order: 2 tons

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