Expanded alloy 4J58 Bar, China Expanded alloy 4J58 Bar Manufacturers, Suppliers, Factory

Product Parameters

1）Chemical Composition

Alloy	C	P	S	Mn	Si	Ni	Fe
4J58	0.03	0.015	0.015	0.60	0.25	57.5-59.5	balance

2）Physical properties

4J58 melting temperature range 1430～1450℃; 4J58 thermal conductivity λ=20.9W/(m?℃).
The 4J58 linear expansion coefficient standard stipulates that the alloy linear expansion coefficient α1 (20~100℃)=(11.1~11.9)×10-6℃-1.

temperature range/℃		temperature range/℃	/10-6℃-1
20～50	10.6	20～400	11.9
20～100	11.3	20～500	12.1
20～200	11.5	20～600	12.3
20～300	11.7

4J58 density ρ=8.32g/cm3; 4J58 electrical properties resistivity ρ=0.3μΩ·m.
4J58 magnetic properties: 4J58 Curie point Tc≈600℃;
4J58 chemical properties: The alloy has good corrosion resistance in the atmosphere, fresh water and sea water. At 4000A/m, the residual magnetic induction intensity Br=0.49T, and the coercive force Hc=50A/m.
Magnetic properties of 4J58 alloy:

H/(A/m)	B/T	H/(A/m)	B/T	H/(A/m)	B/T
8	2.0×10-2	80	0.41	2000	1.49
16	3.0×10-2	160	0.85	4000	1.53
24	5.0×10-2	400	1.19
40	0.10	800	1.37

3）Mechanical properties

4J58 Tensile Properties Tensile properties of alloy (annealed state) at room temperature：

Tensile strength σb/MPa	Yield strength σP0.2/MPa	Elongation δ/%
550	206	35

Application Scenario

4J58heat treatment system: The expansion coefficient performance test specimen specified in the standard is heated to 900°C ± 20°C in hydrogen or vacuum, kept for 1 hour, and cooled to below 200°C at a speed of no more than 5°C/min.
4J58 smelting and casting process: After smelting in a non-vacuum induction furnace or electric arc furnace, electro slag redissolution is performed.

4J58Application Overview and Special Requirements: 4J58 alloy has stable performance and is mainly used to make precision linear rulers (standard rulers) that transmit standard lengths at room temperature (20°C), and to make grading rulers fixed on the bed of coordinate boring machines. Special attention should be paid to the content of carbon and other impurities during production and acceptance, as they are one of the causes of dimensional instability.

Production Process

The manufacturing process of stainless steel and alloys involves multiple steps to transform raw materials into flat,rectangular sheets or plates made of stainless steel and alloys. Here are a few key steps for stainless steel and alloys:

Casting

Molten stainless steel and alloys are cast into large ingots or billets through a casting process.
Hot rolling

During the hot rolling process,the thickness of the steel ingot is gradually reduced and elongated to form long strips or coils.
Annealing

Annealing involves heating stainless steel and alloys to a specific temperature and then slowly cooling it.
Cold rolling

Cold rolling is carried out through rolling mills to reduce thickness to meet customer specifications.

Our Service

Wuxi Walmay Metal Co,Ltd is a comprehensive processing group of Alloy Steel、Forged Parts Fitting、Titanium Alloy、Stainless Steel、Special Welding Wireseries， and more than 800 specifications.

Our group has been engaged in the domestic and global market for more than ten years with rich steel experience and can offer professional advice for customers inapplications with different materials.

Plate processing

Machine cutting

Sheet cutting

plasma cutting

Dynamic waterjet cutting

sawing

Plank leveling

polishing

laser cutting
Long product processing

laser cutting

production cutting

Long product cutting

Bar and structural cutting

polishing
Value-added services

Heat treatment and annealing: Wuxi Walmay Metal can heat treat certain 400 series stainless steels.

Material Reliability Identification (PMI): Wuxi Walmay Metal can complete this testing in-house.

Ut Testing: Ultrasonic testing (UT) uses high-frequency sound energy to inspect and measure stainless steel products.

Specifications	In stock, can be customized according to customer requirements
Form	Bar
Classification	Expanded alloy

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