10 Things To Know When You Order Stainless Steel Foils From China

Stainless steel foils, also called ultra thin stainless steel strip coil.

Goto Hunter Special Steel Co., Ltd to know more.

If you are the beginner of this area, you will be an expert through this guide.

The proportion of the nickel and chromium added is different, and the mechanical properties and application fields of the stainless steel foils produced are different.

It is mainly manifested in the following 10 aspects.

When you purchase stainless steel foils products from China, you could learn more from this article.

What are stainless steel foils standards?

The stainless steels foils can be of the GB, ASTM, JIS, GOST, and DIN standard types, etc.

Usually the ASTM A 240 is the common standard in global market. If you come from Japan, you should consider to JIS standard to order your foils cargo.

All our precision stainless steel foils and strips are manufactured in compliance with the ASTM A240 and GB/T standards.

Common use stainless steel foils grades are often represented by digital symbols.

There are 200 series, 300 series, and 400 series.

Stainless steel is a metal that has good corrosion resistance and mechanical strength, and is used in a wide variety of applications. Most stainless steels contain at least 10.5% chromium, which forms a passive oxide film that prevents further oxidation, preventing corrosion. The chromium content can vary from 0.2% to 20% or more, depending on the grade of stainless steel.

Stainless steel grades can be divided into three categories: Austenitic (austenitic stainless steel), Ferritic and Martensitic.

They are expressed in the United States standard, such as 201, 202, 304, 316, 410, 420, 430, etc.

Chinese stainless steel grades are It is indicated by element symbols plus numbers, such as 1Cr18Ni9Ti, 0Cr18Ni9, 00Cr19Ni10, 1Cr17, 3Cr13, 1Cr17Ni7, etc.

Before sending us the inquiry of stainless steel foils, you should indicate the detailed grade of them.

The hardness of stainless steel foil is measured on the Rockwell scale, which is a combination of two numbers: the first refers to the depth of penetration and the second refers to the area of indentation.

The Rockwell scale is used for measuring hardness in metals and alloys. The test is done by pressing a hardened ball against the surface of a sample material, then measuring how deeply it penetrates. The higher the R-scale value, the harder the material.

There are different methods for determining R-scale values, but they all follow the same basic principle: an indenter (a ball or pyramid) is pressed into a specimen and its depth of penetration is measured. The difference between these tests lies in their size, shape and hardness of material. For example, one test uses a conical diamond pyramid while another uses a cylindrical diamond pyramid.

The mechanical properties of stainless steels foil includes hardness, YS, TS, elongation, etc.

Many customers are very concerned the hardness when buying stainless steel foil from China market. Hardness is directly related to the chemical composition of the stainless steel. Different states also have a great influence. Our hardness range is from 150HV to 600HV.

The surface processing of stainless steel foils have NO.1, 2B, 2D, No. 4, HL, No. 6, No. 8, BA, TR hard, Rerolled bright 2H, polishing bright and other surface finishes, etc.

Are you interested in learning more about Stainless Steel Cold Rolled Coils? Contact us today to secure an expert consultation!

AISI

Stands for American Iron and Steel Institute. The institute serves as the voice of the North American steel industry. AISI numbers are used to categorize metals by alloy type and carbon content, and they do it with four digits. The first two digits of an AISI number refer to the alloy type, and the second two digits refer to carbon content.

ALLOY

A metal made by combining two or more metallic elements. An alloy typically possesses qualities different from those of the components used to create it.

ASM

Stands for American Society for Metals. ASM International is the world’s largest association of metal material engineers and scientists. The association engages and connects materials professionals and their organizations to the resources necessary to solve problems, improve outcomes, and advance society.

ASTM

Stands for American Society for Testing and Materials. ASTM International is a not-for-profit organization that develops standards for materials, products, systems, and services. Metal with an ASTM designation meets the international standards for quality and regulations.

CUT-TO-LENGTH

This process levels coil into a flat sheet or blank. The service provides better length and width tolerances than sheared product, and it can improve diagonal tolerances as well.

DEBURRING

Cutting metals can leave behind burrs, which are unwanted raised edges or protrusions. Deburring is the process of removing these burrs with a tool.

DRAWING

Drawing is a metalworking process that uses tensile forces to stretch metal. As the metal is drawn, it stretches thinner, into a desired shape and thickness.

DRAWING TEMPERATURE

Drawing is usually done at room temperature, classifying it as a cold working process. However, it may be performed at elevated temperatures during special applications like on large wires, rods, or hollow sections in order to reduce forces.

ELONGATION

A metal fabricating term that refers to the degree to which a material can be bent, stretched, or compressed before rupturing. A metal’s elongation is a point between tensile strength and yield strength, and it is typically expressed as a percentage of the original length.

GAUGE

The thickness of sheet metal in the USA is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal.

HEAT LOTS OR HEAT NUMBER

A heat number is an identification number that is stamped on a material plate to prove it meets industry quality standards which require materials to be tested by the manufacturer. The heat lot or heat number is used to identify production runs for quality control purposes.

EDGE ROLLING

Edge rolling is the process of adding finishing edges to metal. It forms the edge of a strip to the desired shape beyond that of a standard slit edge.

MIL STD

Stands for Military Standard. This classification establishes uniform engineering and technical requirements for military-unique or substantially modified commercial processes, procedures, practices, and methods. In order to qualify, materials have undergone rugged, exact testing, equal to the exigencies of combat use.

NORMALIZING TEMPERATURE

Normalization is a heat treatment that relieves stress on steel to improve ductility and toughness in steel that may harden after the cold working process. During normalization, steel is warmed to a temperature just above its upper critical point. Normalized heat treatment facilitates a more uniform final product.

ROCKWELL SCALE

The Rockwell Scale indicates the hardness of materials. Rockwell hardness numbers are most often used to describe the hardness of metals, although they are also used for some plastics. The Rockwell scale is based on measuring the depth of the indentation made by pressing a diamond point into a material.

SAE

Stands for Society of Automotive Engineers. SAE International is a global association of engineers and related technical experts in the aerospace, automotive, and commercial-vehicle industries. Materials meeting SAE standards are internationally recognized for safety, quality, and effectiveness.

SLITTING

Slitting is a precise shearing process, but instead of making cuts at the end of a workpiece like shearing, slitting cuts a wide coil of metal into a number of narrower coils as the main coil is moved through the slitter. During the slitting process, the metal coil passes lengthwise through the slitter’s circular blades.

TEMPER

Temper refers to reheating hardened, normalized, or mechanically worked steel to a temperature below the critical range to soften it and improve impact strength. Tempering results in greater toughness by decreasing an alloy’s hardness.

TENSILE STRENGTH

The maximum stress a material will withstand before fracturing or breaking. The ultimate tensile strength is calculated from the maximum load applied during the test, divided by the original cross-sectional area.

UNS DESIGNATION/NUMBER

Stands for the Unified Numbering System for Metals and Alloys. UNS designation provides a means of correlating internationally used metal and alloy numbering systems currently administered by societies, trade associations, and those individual users and producers of metals and alloys. This system is meant to avoid the confusion caused by using more than one identification number for the same metal or alloy, and the opposite situation of having the same number assigned to two or more different metals or alloys.

YIELD STRENGTH

The amount of stress a material can withstand before causing permanent deformity.

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