High Elastic Alloy for Clockwork Spring: 3J9 (2Cr19Ni9Mo)- SCALE STEEL.

​3J9 (2Cr19Ni9Mo) belongs to the material category of precision alloy. It is a kind of ferrochrome high elastic alloy, and its product [SCALE STEEL]form is usually cold drawn.

Chemical Component Specification (YB/T 5135-2014)
C 0.22~0.26 Cr 19.00~20.50
Si 1.30~1.70 Ni 9.00~10.50
Mn 1.80~2.20 Mo 1.60~1.85
P ≤0.030 Fe REST
S ≤0.020

Mechanical Property for 3J9 (2Cr19Ni9Mo) Alloy:
OD（mm） TYPES TENSILE STRENGTH（MPa）
0.40~0.80 -- ≥2058
＞0.80~1.80 A 1450~1700
B ≥1666
＞1.80~2.50 A 1400~1650
B ≥1600
＞2.50~3.50 -- ≥1470
＞3.50~6.00 -- ≥1375
＞6.00~8.00 —[SCALE STEEL] ≥1300

Elasticity& Shear Modulus for 3J9 (2Cr19Ni9Mo) Alloy:
STATUS ELASTICITY MODULUS E SHEAR MODULUS G
MPa MPa
SOLID SOLUTION 186200~196000 72520~74480
SOLID SOLUTION+AGING 186200~196000 73500~75460
COLD DRAW 166600~176400[SCALE STEEL] 68600~71540
COLD DRAW+AGING 181300~196000 73500~75460

Average Coefficient Of Linear Expansion for 3J9 (2Cr19Ni9Mo) Alloy ā×10-6/℃:
TEM RANGE SOLID SOLUTION SOLID SOLUTION+AGING COLD DRAW COLD DRAW+AGING
－40~20℃ 16.4 17.1 18 17.8
17.6 18.1 18.1
20~50℃ 15.4 16.5 14.6 15.5
16 18.2 15.6 15.9
20~100℃ 16 16 15.9 15.9
16.4 16.2[SCALE STEEL] 16.4 16.1
20~200℃ 16.3 16.3 16.7 16.3
16.7 16.5 16.8 16.5
20~300℃ 16.8 16.7 16.8 16.6
17.2 16.9 17.2 16.9
20~400℃ 17.3 17.2 17.2 17.2
17.7 17.3 17.4 17.4
 
Main Applications for 3J9 (2Cr19Ni9Mo) Alloy:
The main characteristics of 3J9 (2Cr19Ni9Mo) [SCALE STEEL]are non-magnetic, high elasticity, high strength, high hardness, suitable for the manufacture of clocks, timer spring and other elastic components in instruments.