Product Details

42crmo4 specification

AISI 4140 is a chromium molybdenum alloy steel specification widely used in the oil and gas industry. Similar to grade AISI 4130

but with a slightly higher carbon content. The higher carbon content of AISI 4140 gives greater strength and heat treatment capabilities

in comparison to AISI 4130, however it does have inferior weldability characteristics. AISI 4140 machines well in the supply condition of 18-22HRc.

Product Description

Production processes

Forging

Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.

Annealing

Heat the AISI 4140 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 4140 steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed AISI 4140 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 the AISI 4140 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 value.

Typical Mechanical Properties*

	Tensile KSI	0.2% Proof Stress KSI	Elongation %	Reduction of Area %	Hardness HRc	Hardness Brinell
Min	100	80	20	40	18	217
Max	130	110			22	235

(*at room temperature heat treated to 18-22HRc)

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 each AISI 4140 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 alloy steel.

Packaging & Shipping

Our Packing is easily loading and unloading. The way of packing has been widely loved by clients.And it can be customized.

Container condition:

20'GP: maximum length≤5800mm, maximum weight 25 mts

40'GP: maximum length≤11800mm, maximum weight 25mts

Our Services

We have horizontal saw machine, vertical saw machine, CNC flame cutting machine, plane milling machine,

face milling machine, grinding machine equipment to meet customers’ requirements of the steel processing

Company Information

Dongguan Yaoteng Mould steel Co., Ltd is a tool steel stockholders and distributors or suppliers of tool steel and mould steel.

On April 12, 2009, Yaoteng began to develop the international market, our products have been exported to Brazil, Turkey , Mexico, Colombia, Argentina, Dubai, Saudi Arabia, Syria, Iran, Egypt, the Philippines, Indonesia, Malaysia, Vietnam, India and other countries.

Our advantage:

1.Large stocks for various steel grades:Over 5000Mt stock of regular grade and size
2.Competitive price:long term cooperation with most China famous mill to intergrate mills' product line
3.Fast delivery time:Own factories for peeling,milling,grinding and cuting etc
4,Good after-sale service

FAQ

Lara Liao

Tel: +86-0769-3389 9333

Fax: +86-0769-8870 5839

Skype: lara.liao80

Email: laraliao AT toolsteel DOT net DOT cn

lara AT otaisteel DOT com

TM: cn1511348531

Mobile: 86 3711884714