Overview
| Product characteristics | Low expansion coefficient | Product name | Nickel iron alloy |
| Grade | 4J36 | producing area | Changzhou |
| Nickel content | 35%~37% | Impurity content | 0.001% |
Product Details
Changzhou Bailian Special Steel Co., Ltd
Low expansion alloy
4J36 is a low expansion iron-nickel alloy with an expansion coefficient. The control of carbon and manganese components is very important. Cold deformation can reduce the coefficient of thermal expansion, and heat treatment within a specific temperature range can stabilize the coefficient of thermal expansion. 4J36 has corrosion resistance in dry air at room temperature. In other harsh environments, such as humid air, corrosion (rusting) may occur.
Brand:4J32, 4J36, invarInvar steelInvar alloy
Executive standard: YB/T 5241-2005
purpose4J32, 4J36Suitable for manufacturing instrument parts with dimensional requirements within the range of environmental temperature changes.
The grades and chemical composition of 4J32 and 4J36 alloys:
alloy | Chemical composition (mass fraction) (%) | |||||||||
C | Si | P | S | Cu | Se | Mn | Ni | Co | Fe | |
≤ | ||||||||||
4J32 | zero point zero five | zero point two zero | zero point zero two zero | zero point zero two zero | 0.40~0.80 | --- | 0.20~0.60 | 31.5-33.0 | 3.20-4.20 | allowance |
4J36 | zero point zero five | zero point three zero | zero point zero two zero | zero point zero two zero | ---- | --- | 0.20 to 0.60 | 35.0~37.0 | ---- | allowance |
Linear expansion coefficient of 4J32 and 4J36 alloys:
Combined number | Sample heat treatment system | Average linear expansion coefficient ā／ (10-6/℃) | |
20-100 ℃ | 20-300 ° C | ||
4J32 | Heat the semi-finished sample to 840 ± 10 ° C, hold for 1 hour, water quench, and then process the sample into a finished sample. Heat preservation at 315 ± 10 ℃ for 1 hour with furnace cooling or air cooling | ≤ 1.0 | |
4J36 | ≤ 1.5 | ||
Typical expansion coefficients of 4J32 and 4J36 alloys:
Combined number | Average linear expansion coefficient ā／ (10-6/℃) | |||||
20-50 ℃ | 20-100 ℃ | 20-200 ℃ | 20-300 ℃ | 20-400 ℃ | 20-500 ℃ | |
4J32 | zero point seven | zero point eight | one point four | four point three | seven point two | nine point three |
4J36 | zero point six | zero point eight | two | five point one | eight | ten |
Note: The data listed in the table is for reference only.