Name: SAE 4140 Forged Alloy Steel Flat Bar Factory Price Steel Plate
Brand: SongShun
Availability: InStock

Product Details

SAE 4140 Forged Alloy Steel Flat Bar Factory Price Steel Plate

1. AISI/ASTM 4140 Chemical composition

C	0.38-0.45%	Cr	0.90-1.20%
Si	0.17-0.37%	Mo	0.15-0.25%
Mn	0.50-0.80%	Ni	≤0.30%
P	≤0.035%	S	≤0.035%

2. SAE 4140 Equivalent Steel Grade

3. ASTM 4140 Mechanical Properties

Tensile Strength	σb (MPa):≥1080(110)
Yield Strength	σs (MPa):≥930(95)
Elongation	δ5 (%):≥12
Reduction	ψ (%):≥45
Impact Energy	Akv (J):≥63
Impact Toughness	akv (J/cm2):≥78(8)
Annealed Hardness	≤217HB

4. 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.

5. Surface Treatment

Plate: Origin Black, Orign cold rolled bright, Machined, Grinded

Bar: Origin Black, Orign cold rolled(drawn) bright, Turned, Peeled, Grinded

6. Heat Treatment

(1) Forging

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

(2)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.

(3)Stress Relieving

When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.

(4)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.

(5)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.

7. Product Photo

8. Company Introduction

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.

9. Customer Photos

We warmly welcome new and old customers to establish good and long term relationship with us based on equality and mutual assistance.

10.Certifications

11.Product packaging

12.FAQ

Q:Are you a factory or a trading company?

A: The fact is that we are a company. We have own factory and several warehouses.

Under the trend of globalization of the world, we established a professional foreign trade department to change the world.

Q: What is your delivery date?

A: The delivery date is about 10-30 days after receipt of payment.

Q: Can I get some samples?

A: We are honored to offer you samples.