关于钢材长度尺寸，你知道多少？

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钢的长度、宽度、高度、直径、半径、内径、外径和壁厚。钢材长度的法定计量单位为米（m）、厘米（CM）和毫米（mm）。在目前的实践中，它也以英寸（“）表示，但它不是法定的计量单位。

你对钢材的长度和尺寸了解多少？
1.钢的范围和尺寸
规定钢材的范围和尺寸是节约材料的有效措施。范围大小是指长度或长宽比不小于某一尺寸，或者长度和长宽比在从多少到多少的尺寸范围内交付。生产单位可根据尺寸要求进行生产和供货。
2.不定长（正常长度）
如果产品尺寸（长度或宽度）在标准规定的范围内，且不需要固定尺寸，则称为不定尺。不定长度也称为正常长度（全长）。交付不同长度的金属材料可在规定长度内交付。例如，如果普通圆钢的长度不超过25mm，通常规定为4~10m，则可交付该长度范围内的圆钢。
3.尺寸
根据订单要求切割成固定尺寸称为固定长度。按固定长度交货时，交付的金属材料必须具有需方在订货合同中规定的长度。例如，如果合同中规定按5米的固定长度交货，则交付的材料必须为5米长，小于5米或大于5米的材料不合格。但实际上，交货长度不能超过5m，因此规定允许正偏差，不允许负偏差。
4.双尺
根据订单要求的固定尺寸切割成整数倍数称为多倍尺。按多倍长度交货时，所交付金属材料的长度必须是需方在订货合同中规定的长度（称为单倍长度）的整数倍（加锯切）。例如，如果需方在订货合同中要求单尺长度为2m，则切成双尺时长度为4m，切成三倍尺时长度为6m，并分别增加一个或两个锯口。
标准中规定了锯切量。在交付多个长度时，只允许正偏差，不允许负偏差。
5.短尺

如果长度小于标准规定的不定长度下限，但不小于允许的最小长度，则称为短长度。如《输水输气钢管标准》规定，每批2-4m长的短钢管（按根数计算）允许使用10%。4m为不定长下限，最短允许长度为2m。

Length, width, height, diameter, radius, inner diameter, outer diameter and wall thickness of steel. The legal measurement unit of steel length is meter (m), centimeter (CM) and millimeter (mm). In current practice, it is also expressed in inches (″), but it is not a legal unit of measurement.
What do you know about the length and size of steel?
1. Range and size of steel
Specifying the range and size of steel is an effective measure to save materials. Range sizing means that the length or length by width is not less than a certain size, or the length and length by width are delivered within the size range from how much to how much. The production unit can produce and supply according to the size requirements.
2. Indefinite length (normal length)
If the product size (length or width) is within the range specified in the standard and no fixed size is required, it is called indefinite ruler. Indefinite length is also called normal length (full length). Metal materials delivered to varying lengths can be delivered within the specified length. For example, if the length of ordinary round steel not more than 25mm is usually specified as 4 ~ 10m, the round steel with the length within this range can be delivered.
3. Sizing
Cut into fixed sizes according to the order requirements is called fixed length. When delivering according to the fixed length, the delivered metal materials must have the length specified by the demander in the order contract. For example, if it is stated in the contract that the goods shall be delivered according to the fixed length of 5m, the materials delivered must be 5m long, and those shorter than 5m or longer than 5m are unqualified. However, in fact, the delivery cannot be 5m long, so it is stipulated that positive deviation is allowed and negative deviation is not allowed.
4. Double ruler
Cut into integral multiples according to the fixed size required by the order is called multiple ruler. When delivering by multiple length, the length of the delivered metal material must be an integral multiple of the length (called single length) specified by the demander in the order contract (plus sawing). For example, if the demander requires the length of a single ruler to be 2m in the order contract, the length is 4m when it is cut into double ruler and 6m when it is cut into three times ruler, and one or two saw cuts are added respectively.
The sawing amount is specified in the standard. Only positive deviation is allowed, and negative deviation is not allowed during delivery of multiple lengths.
5. Short ruler
If the length is less than the lower limit of indefinite length specified in the standard, but not less than the allowable minimum length, it is called short length. For example, it is stipulated in the standard for water and gas transmission steel pipes that 10% of 2-4m long short steel pipes (calculated by the number of pipes) are allowed in each batch. 4m is the lower limit of indefinite length, and the shortest allowable length is 2m.