1.7709, Afnor 20cdv5.7, 21crmov5.7 Steel Round Bar

Product Description

 

Product Description

1.7709, AFNOR 20CDV5.7, 21CrMoV5.7
Standard reference:

EUROPE EN 10269: 2003
ITALY (UNI 7845-78)
GERMANY (DIN 17200-86) / DIN 17240
FRANCE (NF A 35-552-86)
UK (BS 970 pt.3-96)
USA ASTM A 29
AD 2000 W7

Chemical Analysis (Mass-%)

Element	C	Si	Mn	P	S	Cr	NI	Mo	V	Al
min.	0.17	0.15	0.4	-	-	1.2	-	0.65	0.25	-
Max.	0.25	0.35	0.8	0.025	0.03	1.5	0.6	0.8	0.35	0.03

Mechanical Properties

The mechanical properties of 1.7709 steel are defined by its condition, typically in a quenched and tempered state (+QT). The properties include yield strength, tensile strength, elongation, reduction of area, and impact energy. For instance, in the quenched and tempered condition, the steel exhibits:

- Yield Strength: ≥ 550 N/mm²
- Tensile Strength: 700-850 N/mm²
- Elongation: ≥ 16%
- Reduction of Area: ≥ 60%
- Impact Energy (Charpy-V): ≥ 63 J

These properties make it suitable for applications requiring high strength and toughness, especially at elevated temperatures.
Heat Treatment
The heat treatment process for 1.7709 steel involves hardening and tempering. The typical heat treatment parameters are:

- Hardening: Heating to 880-950°C followed by quenching in air, oil, polymer, or water.
- Tempering: Heating to 680-720°C for at least 2 hours, followed by air cooling.

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