Invar Alloy 4J36 Strip/Foil/Sheet Manufacturer - Premium Quality at Factory Prices

4J36 (similar grades: Invar, FeNi36, Invar Standard, Vacodil36) alloy, also known as Invar (INVAR) alloy, the Curie point of the alloy is about 230 ℃, below this temperature the alloy is ferromagnetic, with very low The expansion coefficient is higher than this temperature, the alloy is non-magnetic, and the expansion coefficient increases. Alloy control of carbon and manganese composition is very important. 4J36 has corrosion resistance in dry air at room temperature, while corrosion (rust) may occur in other harsh environments, such as humid air. The alloy is mainly used to manufacture components with approximately constant dimensions within the range of temperature changes, and is widely used in the radio industry, precision instruments, meters and other industries. The alloy heat treatment can be divided into: stress relief annealing, intermediate annealing and stabilization treatment. (1) Stress relief annealing, the purpose is to eliminate the residual stress of the parts after machining, the temperature is 530～550℃, the heat preservation is 1～2h, and the furnace is cooled. (2) Intermediate annealing, the purpose is to eliminate the work hardening phenomenon caused by the cold rolling, cold drawing, and cold stamping of the alloy, so that the subsequent processing can be continued. Specifically, the workpiece is heated to 830-880°C, kept for 30 minutes, furnace-cooled or air-cooled. (3) The purpose of stabilization is to obtain a lower expansion coefficient while maintaining stable performance. 4J36 can be welded by all welding processes, and can be welded by oxyacetylene welding, arc welding, electric welding and hydrogen atom welding, and does not require pre- and post-weld heat treatment. Before welding, the material must be in an annealed state, clean, free of oil, scratches, marking paint, etc., low heat input must be used, and the interlayer temperature should be less than 120°C. Since the expansion coefficient of the alloy is related to the chemical composition, in order to avoid changes in the alloy composition caused by welding, it is best to use argon arc welding. The filler metal for welding should preferably contain 0.5% to 1.5% of titanium to reduce welding pores and cracks. chemical composition %

Ni	35~37.0	Fe	Bal.	Co	-	Si	≤0.3
Mo	-	Cu	-	Cr	-	Mn	0.2~0.6
C	≤0.05	P	≤0.02	S	≤0.02

Physical properties

Density	Resistivity at 20℃	Thermal conductivity	Elastic modulus	Curie point
(g/cm³)	(Ωmm²/m)	λ/ W/(m*℃)	E/ Gpa	T_c/ ℃
8.1	0.78	11	144	230

Coefficient of expansion

θ/℃	α₁/10^-6℃^-1	θ/℃	α₁/10^-6℃^-1
20~-60	1.8	20~250	3.6
20~-40	1.8	20~300	5.2
20~-20	1.6	20~350	6.5
20~-0	1.6	20~400	7.8
20~50	1.1	20~450	8.9
20~100	1.4	20~500	9.7
20~150	1.9	20~550	10.4
20~200	2.5	20~600	11.0

Mechanical performance

Tensile strength	Elongation
Mpa	%
641	14
689	9
731	8

Temperature Coefficient of Resistance

Temperature range ℃	20~50	20~100	20~200	20~300	20~400
a_R/ 10³ *℃	1.8	1.7	1.4	1.2	1.0

Product heat treatment process
Stress relief annealing	Heat to 530~550℃, keep warm for 1~2 h. Cool in the furnace.
Annealing	The workpiece is heated to 830~880℃, and kept for 30 minutes. Furnace cooling.
Stabilization	Heat to 830 ℃ in protective atmosphere, keep for 20min. ~ 1h, quench. Temper
Precautions	The alloy cannot be hardened by heat treatment. Surface treatment can be sandblasted, polished and pickled.

Supply form and specification

Alloy grade	Form	Size
4J36	Wire	D= 0.1~8mm
4J36	Strip	W= 5~250mm	T= 0.1mm
4J36	Foil	W= 10~100mm	T= 0.01~0.1mm
4J36	Bar	Dia= 8~100mm	L= 50~1000mm

Expansion alloy Series: 4J29 4J33 4J36 4J42Shijiazhuang Chengyuan Alloy Material Co., Ltd. is a high-tech enterprise specializing in the production of various alloy materials. It has an advanced and complete production line, including material smelting, surface cleaning, rolling, slitting, and a complete test process. Meet the corresponding quality inspection of different products. The company focuses on the production and supply of various electric heating alloys, expansion alloys, soft magnetic alloys, elastic alloys, high temperature alloys and all kinds of pure metals. The product forms include wire, flat wire, strip, plate, bar, foil, Seamless pipe, wire mesh, powder, etc. can meet the application needs of different customers. The various performance indicators of the product are strictly in accordance with the national standards. If customers put forward non-standard requirements, they can also be implemented by reference. Our products are widely used in heating equipment, machinery manufacturing, electric furnace production, instrumentation, household appliances, mineral mining, aerospace, petroleum and nuclear power and other industries, and have received good market feedback. Our products have stable delivery time, excellent quality, sophisticated packaging, and high repurchase rate. They are not only widely recognized in the domestic market, but also have a good reputation in the international market.

* OEM manufacturer * We will deliver the goods to the warehouse of the customer's agent in any city in China. * Terms of delivery: EXW, FCA, FOB, CIF, CPT, DAP * Mode of transport: Sea, Auto, Railway, Air and Express * Payment terms: Bank Transfer, Western Union, PayPal, Alipay * Quality Certificate: In order to improve the quality of products and services, with each order we provide a quality certificate for goods, which includes measured data - chemical composition, electrical resistivity, tensile strength, elongation, melting number, etc. Cheng Yuan Alloy Material Co., Ltd Email: [email protected] Tel .: +86 13673186216 +86 311 8803 3197