Sai International

Sai International

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Types of Stainless Steel Grades

The STAINLESS STEEL grades that are the most common are Type 302/304, Type 305 (non-magnetic) and Type 316.

Type 302/304 is 18-8 (18 parts chromium and 8 parts nickel) stainless steel and is most commonly used in the manufacture of wire rope. This type of stainless steel is commonly used in applications that require more corrosion protection than is available from galvanized carbon steel cable. Contrary to popular belief, stainless steel is not stronger than galvanized carbon steel cable. The fact is, it usually has a lower breaking strength than galvanized carbon steel cable of the same diameter and construction.

Type 305 S/S cable (non-magnetic) is commonly available in 1/16" and 1/32" diameters. This type of S/S is generally used in applications where sensitive instrumentation or other systems might be affected by magnetism.

Type 316 S/S is increasingly popular in many outdoor salt air environments. It has excellent corrosion protection and is the preferred choice of the marine industry. The increase in popularity of Type 316 S/S has spurred the availability of many wire rope terminals also becoming available in Type 316 S/S.

Monel is an uncommon grade of stainless and is used in applications where added resistance to corrosive substances and liquids are required. The main drawbacks to Monel are that its minimum breaking strength is about 30% less than that of Type 302/304 S/S and that it is not readily available.

CARBON STEEL WIRE is available in different grades, sometimes referred to as Plow Steel, Improved Plow Steel, or even Extra Improved Plow Steel. Wire rope manufactured from uncoated wire is commonly referred to as Bright. Bright wire rope is available in sizes 1/4 inch and over.

GALVANIZED carbon steel wire is frequently used to manufacture wire rope. Galvanized wire rope provides good corrosion protection in mild environments. In smaller sizes (less than 1/4 inch) it is almost automatically used when stainless steel is not specified

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Types of Stainless Steel Grades

Steel Rope Decomposition

Steel Rope Decomposition 

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Steel Rope Decomposition

Construction of Wire Rope

Construction of Wire Rope. The basic unit of wire-rope construction is the individual wire made of steel or other metal in various sizes. These wires are laid together to form strands. The number of wires in a strand varies according to the purpose for which the rope is intended. A number of strands are laid together to form the wire rope itself.Wire rope is designated by the number of strands per-rope and the number of wires per strand. Thus, a 6 X 19 rope has 6 strands with 19 wires per strand, but has the same outside diameter as a 6 X 37 wire rope, which has6 strands with 37 wires of much smaller size per strand.Wire rope made up of a large number of small wires is flexible, but the small wires break so easily that the wire rope is not resistant to external abrasion. Wire rope made up of a smaller number of larger wires is more resistant to external abrasion, but is less flexible.The strands of the wire rope are laid up around a central core, which may be fiber, a single strand of wire,or an independent wire rope. A fiber core contributes flexibility, cushions the strands as the wire rope contracts under strain and holds a portion of lubricant for continuous lubrication. A wire core is stronger than fiber core and can be used where conditions such as-high temperatures would damage the fiber. Some end views of the arrangements of strands in wire ropes are shown in figure.
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Construction of Wire Rope

Types of Stainless Steel Grades

The STAINLESS STEEL grades that are the most common are Type 302/304, Type 305 (non-magnetic) and Type 316.

Type 302/304 is 18-8 (18 parts chromium and 8 parts nickel) stainless steel and is most commonly used in the manufacture of wire rope. This type of stainless steel is commonly used in applications that require more corrosion protection than is available from galvanized carbon steel cable. Contrary to popular belief, stainless steel is not stronger than galvanized carbon steel cable. The fact is, it usually has a lower breaking strength than galvanized carbon steel cable of the same diameter and construction.

Type 305 S/S cable (non-magnetic) is commonly available in 1/16" and 1/32" diameters. This type of S/S is generally used in applications where sensitive instrumentation or other systems might be affected by magnetism.

Type 316 S/S is increasingly popular in many outdoor salt air environments. It has excellent corrosion protection and is the preferred choice of the marine industry. The increase in popularity of Type 316 S/S has spurred the availability of many wire rope terminals also becoming available in Type 316 S/S.

Monel is an uncommon grade of stainless and is used in applications where added resistance to corrosive substances and liquids are required. The main drawbacks to Monel are that its minimum breaking strength is about 30% less than that of Type 302/304 S/S and that it is not readily available.

CARBON STEEL WIRE is available in different grades, sometimes referred to as Plow Steel, Improved Plow Steel, or even Extra Improved Plow Steel. Wire rope manufactured from uncoated wire is commonly referred to as Bright. Bright wire rope is available in sizes 1/4 inch and over.

GALVANIZED carbon steel wire is frequently used to manufacture wire rope. Galvanized wire rope provides good corrosion protection in mild environments. In smaller sizes (less than 1/4 inch) it is almost automatically used when stainless steel is not specified

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Types of Stainless Steel Grades

Lay

Lay

The lay of the strand, wire rope or cable, is the direction in which the helix of the wires orbit the core. An easy way to determine the lay is to hold the specimen vertically in front of you and observe whether the strands or wires travel up and to the right or up and to the left. Just as you might visually determine the direction of a thread on a bolt. There are other types of lay or wire rope, such as Lang and Herringbone. These types of lays in wire rope are for special purposes, so we will not go into them here.

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Lay

Coating

 

The coating of a cable is optional, but can serve many useful purposes. The most common types of coatings are PVC Polyvinylchloride, various Nylon compounds and Teflon. These materials are referred to as compounds. These compounds are applied to the cable via the use of a plastic extrusion machine.

 

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Coating

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Manish Nagpal (Manager)
Sai International
Kirti Nagar, 34 C, Ram Garh
Moti Nagar, New Delhi - 110015, Delhi, India
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