High Silicon Leaf Carbon Spring Steel ASTM9260 DIN60Si7 Grade For
Automotive
Spring steel refers to the special alloy steel used to manufacture
all kinds of springs and other elastic components. According to the
performance requirements and service conditions, it can be divided
into ordinary alloy spring steel and special alloy spring steel.
Spring steel has excellent comprehensive properties, excellent
metallurgical quality (high purity and uniformity), good surface
quality (strict control of surface defects and decarburization),
and accurate shape and size.
ASTM 9260 has high strength, good elasticity and good performance
of temper resistance. It is easy to decarburize and graphitize, and
the hardenability is not high. It is the main kind of spring steel,
and widely used to manufacture all kinds of springs, such as leaf
springs, coil springs of automobiles, locomotives, and tractors;
cylinder safety valve springs, and some important springs operating
under high stress, which have serious wear and tear.
- GENERAL CHARACTERISTICS OF ALLOY STEEL 9260 Alloy steel 9260 is a
high-silicon grade especially designed for its spring properties.
- APPLICATIONS Leaf and truncated conical springs for automotive and
general engineering
- FORGING A recommendation for general applications is 1925 – 1560ºF
(1050-850ºC) and for springs 1650 – 1560ºF (900 – 850ºC.) Parts
should be slow cooled after forging or transferred to an
equalization treatment.
HEAT TREATMENT:
- Annealing: To produce a structure of coarse to fine spheroidite, parts should
be austenitized at 1400ºF (760ºC) and cooled to 1300ºF (705º) at a
rate of 10ºF/hr., or alternately cooled to 1225ºF (660ºC) and held
for 10 hours as an iso-anneal.
- Normalizing: 1650ºF (900ºC) and air cool. This will be an important treatment
for this grade.
- Hardening: Austenitize at 1525-1580ºF (830-860ºC) and water quench.
- Tempering: 880-970ºF (470-520ºC)
- Machinability: Parts could be machined following a spheroidize anneal
- Weldability: The grade would not normally be welded.
| STEEL SPRINGS AVERAGE DIMENSION(mm) |
| 60x1.60 | 55x1.0 | 45x1.0 | 30x1.0 |
| 60x1.50 | 65x1.40 | 55x1.40 | 45x1.40 |
65x1.20
| 45x1.50 | 55x1.30 | 45x1.30
|
| 60x1.0 | 55x1.20 | 45x1.20 | 35x1.20 |
| 80x1.40 | 50x1.0 | 40x1.0
| 40x1.40 |
| 80x1.40 | 60x1.40 | 50x1.40 | 40x1.30
|
| 50x1.50 | 60x1.30 | 50x1.30 | |
| 60x1.20 | 50x1.20 | 40x1.20 | |
APPLICATIONS
Alloy Steel 9260 is used in a number of different products and
industries including:
- Airplanes
- Military weaponry
- Rail transportation
- Bridges
- Machine tools
- Knives and swords
SUPPLY RANGE OF ALLOY 9260
-Dimension: Diameter 4-1600 mm, any length below 16 meters
AISI Steel 9260 Specification and Relevant Standards
| Country | USA | BS | Japan | China |
| Standard | ASTM A29 | EN 10083 | JIS G4801 | GB/T 3077 |
| Grades | 9260 | 1.7108/61SiCr7 | SUP 7 | 60Si2Mn/A |
ASTM 9260 Steels Chemical Composition %
| Standard | Grade | C | Mn | P | S | Si |
| ASTM A29 | 9260 | 0.56-0.64 | 0.75-1.00 | 0.035 | 0.040 | 1.80-2.20 |
ASTM 9260 Steels Mechanical properties
| Properties | Conditions |
| T (°C) | Treatment |
| Density (×1000 kg/m3) | 7.7-8.03 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Tensile Strength (Mpa) | 1758 | 25 | oil quenched, fine grained, tempered at 425°C more |
| Yield Strength (Mpa) | 1503 |
| Elongation (%) | 8 |
| Reduction in Area (%) | 24 |
| Hardness (HB) | 600 | 25 | oil quenched, fine grained, tempered at 205°C more |
PROCESSING
FORGING
A recommendation for general applications is 1925 – 1560ºF
(1050-850ºC) and for springs 1650 – 1560ºF (900 – 850ºC.) Parts
should be slow cooled after forging or transferred to an
equalization treatment.
HEAT TREATMENT
Annealing: To produce a structure of coarse to fine spheroidite, parts should
be austenitized at 1400ºF (760ºC) and cooled to 1300ºF (705º) at a
rate of 10ºF/hr., or alternately cooled to 1225ºF (660ºC) and held
for 10 hours as an iso-anneal.
Normalizing: 1650ºF (900ºC) and air cool. This will be an important treatment
for this grade.
Hardening: Austenitize at 1525-1580ºF (830-860ºC) and water quench.
Tempering: 880-970ºF (470-520ºC)
Machinability: Parts could be machined following a spheroidize anneal
Weldability: The grade would not normally be welded.
