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

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

3J9 (2Cr19Ni9Mo) belongs to the material category of precision alloy. It is a kind of ferrochrome high elastic alloy, and its product [TJC 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	—[TJC STEEL]	≥1300

Elasticity& Shear Modulus for 3J9 (2Cr19Ni9Mo) Alloy:

STATUS	ELASTICITY MODULUS E	SHEAR MODULUS G
STATUS	MPa	MPa
SOLID SOLUTION	186200~196000	72520~74480
SOLID SOLUTION+AGING	186200~196000	73500~75460
COLD DRAW	166600~176400[TJC 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
－40~20℃	17.6	18.1	18	18.1
20~50℃	15.4	16.5	14.6	15.5
20~50℃	16	18.2	15.6	15.9
20~100℃	16	16	15.9	15.9
20~100℃	16.4	16.2[TJC STEEL]	16.4	16.1
20~200℃	16.3	16.3	16.7	16.3
20~200℃	16.7	16.5	16.8	16.5
20~300℃	16.8	16.7	16.8	16.6
20~300℃	17.2	16.9	17.2	16.9
20~400℃	17.3	17.2	17.2	17.2
20~400℃	17.7	17.3	17.4	17.4

Main Applications for 3J9 (2Cr19Ni9Mo) Alloy:

The main characteristics of 3J9 (2Cr19Ni9Mo) [TJC STEEL]are non-magnetic, high elasticity, high strength, high hardness, suitable for the manufacture of clocks, timer spring and other elastic components in instruments.