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Sizes

Length Dimensions of Steel Materials








Length dimensions of steel material are the most basic sizes of various kinds of steel, which refer to the length, width, height, diameter, radius, inner diameter, outer diameter, and wall thickness, etc. of the steel.The legal units for steel length are meter (m), centimeter (cm), and millimeter (mm). Sometimes it is also expressed in inches (″), however, it is not a legal unit.

1. Fixed scale of steel materials within a certain rangeItis an effective measure to save materials. Fixed scale within a certain range requires that the length or the product of length and width is not smaller than a certain number, or that the length, or the product of length and width is within a size range. The producer may manufacture and supply the products according to this size requirement.
 
2. Unfixed scale (usually the length)If the size (length or width) of steel is required to be within the defined standard range, while not required as unfixed, the requirement is called an unfixed scale. Unfixed scale length can also be called usual length. Any metal product to be delivered according to unfixed scale can be delivered as long as they are within the defined range of lengths. For example, a commercial round steel of the size no greater than 25 mm can be delivered as long as its length is between 4 m and 10 m, which is its usual length.

3. Fixed scaleIn this situation, the steel must be cut into a fixed size according to the ordering request, which is called the fixed scale. The delivered metal products according to fixed scale must have the same length as is requested in the ordering contract. For example, if the fixed scale length is 5 m in the contract, all the products delivered must be 5-meter long. Any product shorter or longer than 5 m is not qualified. Actually products delivered are always not exactly 5-meters long. Therefore, it is stipulated that the positive deviation is allowed while the negative deviation in no allowed.



4.Multiple scalesIt requires the goods to be cut according to the contract into multiples of a fixed size, which is called a multiple scale. When the products are delivered according to multiple scales, the metal material’s length must be the multiples of the size requested in the ordering contract (single scale). For example, if the single scale length requested in the contract is 2m, it must be 4m long while cut according to double scale, and is 6m long according to triple scale. The length of one or two saw-size should be added, which is stipulated in the standard.

When delivering according to multiple scales, only positive deviations are allowed, while negative deviations are prohibited.

5. Short scaleIf the length is smaller than the lower limit of the defined unfixed scale length, but not smaller than the allowable minimum length, this is called short scale. For example, as stipulated in the standard of steel pipe for water and gas delivery, it is allowable that in every batch there are 10% short scale pipes of length between 2m to 4m, where 4 m is the lower limit of the unfixed scale and the shortest length allowed is 2m.

6. Narrow scaleIf the width is smaller than the lower limit of the unfixed scale but not smaller than the allowable minimum width, this is called narrow scale. While delivering according to narrow scale, we must pay attention to the percentage of the short scale and the narrowest scale stipulated in the standard

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EN 10216-5
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UNS N08020 Alloy 20 Tubing
UNS N02200 Alloy 200 Tube
UNS N02201 Alloy 201 Pipe
UNS N04400 Monel 400 Tubing
N06600 Inconel 600 Tube
N06601 Inconel 601 Tubing
N06625 Inconel 625 Tubes
N08800 Incoloy 800 Tube
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ASTM B622 N10276 C276 Tubing
ASTM B622 N06022 Hastelloy C-22 Alloy Tubes
C28000 Brass Seamless Tubes C44300 Brass Seamless Tubes
C68700 Brass Seamless Tubes
C70600 Copper Nickel Tubes
C71500 Copper Nickel Tubes
DIN 2391 Seamless Precision Steel Tubes
EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube