What is the Inva ruler?

The only manufacturer in China of the first-class special and special special precision invar level scale, designed and manufactured by international standards and processes, and the accuracy indicators are ahead of the international contemporary level.

Ruler: choose stainless steel, aluminum, composite materials and others according to user needs;

Ruler type: designed according to user needs or manufactured according to user drawings;

Ruler body: 0 100m can be manufactured;

Main Specifications:

6. Standard CH8008-92 Invar alloy strip 4J36 is used, and the linear expansion coefficient is used; the difference between the true length of the meter interval and the nominal length; Meter interval average true length ; The difference between the true length and the nominal length of the decimeter division, the difference between the basic and auxiliary constants of the ruler and the zero point height difference, and the vertical axis of the ruler and the bottom plane are perpendicular to 5; Flatness of the bottom plane ; ulnar sagittal distance 3mm; The numerical annotation is decimeter and centimeter, and the division interval is 10mm and 5mm, and there are two kinds of positive and inverted images.

The ruler body uses 4J36 low-expansion iron-nickel alloy, which is less affected by temperature and has high precision, because the 4J36 material itself has a separate name, called Invar alloy, so the ruler made by him is called Invar ruler.

<> "Shanghai Bingzheng Industrial **** Production and Sales 4J36

invar feature.

invar is an abbreviation for invariability, which means that the volume does not change.

The vast majority of metals and alloys expand in volume when heated and shrink when cooled, but due to its ferromagnetism, Invar alloy has an abnormal thermal expansion due to the invar effect in a certain temperature range, and its expansion coefficient is extremely low, sometimes even zero or negative. Its characteristics are summarized as follows:

The coefficient of expansion is small.

The average coefficient of expansion of Invar alloys is generally that the volume does not change at room temperature -80 +100.

The strength and hardness are not high.

The carbon content of the Invar alloy is less, the hardness and strength are not high, the tensile strength is about 517MPa, the yield strength is about 276MPa, and the Vickers hardness is about 160.

Low thermal conductivity.

The thermal conductivity of Invar alloy is 10W m·k, which is only 45 of steel

High plasticity and toughness.

The plasticity, toughness, elongation, section shrinkage and impact toughness are all high, with elongation δ = 30 45% and shrinkage δ = 50 70%. Impact toughness k=130 310 j cm2.

Other properties Due to the high nickel content of the Invar alloy, the hardenability and hardenability of the steel are improved, and the gas resistance, corrosion resistance and wear resistance of the steel are improved.

Use. Due to the advantages of low expansion, 4J36 is widely used in the electronics industry and precision instrument industry and other fields sensitive to size requirements, mainly used as: bimetal materials, magnetic materials, fixtures for measuring instruments, celestial telescope components, optical instruments, metal molds for CFRP, antenna components, shielding frames for FPD, frames for high-precision printing, inspection fixtures for semiconductors, and processing fixtures for semiconductors.

4J36 alloy is also known as Invar alloy, Invar, the Curie point of the alloy is about 230, the alloy is ferromagnetic when it is lower than this temperature, and has a very low coefficient of expansion, and when the alloy is non-magnetic when it is higher than this temperature, the coefficient of expansion increases.

The alloy is mainly used to manufacture components with approximately constant dimensions within the temperature change range, and is widely used in the radio industry, precision instruments, meters and other industries.

4J36 similar grades:

32H (Russia), Invar (UK), Invar 36 (US), Unipsan 36 (US), NI1036, NI36FE, unchanged steel (Japan).

FE-NI36 (France), WGermany), X1NicrMocu, N 25-20-7 (UK) 4J36, UNSK93600 Thermostat Alloy, UNSK93601 Pressure Vessel Plate (USA) Non-expanding steel Hengfan Steel, UNS K93600

Shanghai Boseman.

4J36 Metallographic structure: The alloy is a single-phase austenitic structure.

4J36 process performance and requirements:

1. The alloy is easy to be processed cold and hot. Heating in a sulfur-containing atmosphere should be avoided during thermal processing.

2. The cutting characteristics of this alloy are similar to those of austenitic stainless steel. High-speed steel or cemented carbide tools are used for machining, and low-speed cutting is used. Coolant can be used during cutting.

The alloy has good grinding properties. Known as the king of metal, it is an indispensable structural material for precision instruments and equipment.

4J36 Main Specifications:

4J36 seamless pipe, 4J36 steel plate, 4J36 round bar, 4J36 forging, 4J36 flange, 4J36 ring, 4J36 welded pipe, 4J36 steel belt, 4J36 straight bar, 4J36 wire and supporting welding consumables, 4J36 round cake, 4J36 flat bar, 4J36 hexagonal bar, 4J36 reducer head, 4J36 elbow, 4J36 tee, 4J36 machining parts, 4J36 bolt nut, 4J36 fastener.

Instruments with analytical control, remote transmission, and digital interfaces, such as ultrasonic level gauges, which used to be analogue circuits, are now digital models, with HART RS485, which can also distinguish false echoes.