---
title: "钢重量表：圆棒、方管、扁钢与管材的 kg/m"
description: "6-100 mm 钢圆棒、方形空心型材、扁钢和管材的每米重量——附公式 kg/m = 0.00785 x 面积（mm2）与演算示例。"
image: "https://nestingcalc.com/og-default.png"
url: "https://nestingcalc.com/cn/guides/steel-weight-table/"
locale: "zh-Hans"
---

# 钢重量表：圆棒、方管、扁钢与管材的 kg/m

6-100 mm 钢圆棒、方形空心型材、扁钢和管材的每米重量——附公式 kg/m = 0.00785 x 面积（mm2）与演算示例。

## 钢重量公式：kg/m = 0.00785 x mm2

这张表里每个每米重量数值都来自同一个公式：kg/m = 截面积（mm2）x 0.00785。这个常数就是钢的密度（7,850 kg/m3）除以一百万。20 mm 圆棒的面积为 314 mm2，因此重量为 314 x 0.00785 = 2.47 kg/m。记住 0.00785，你就能在几秒内核验任何钢重量表——或者用 [金属重量计算器](https://nestingcalc.com/cn/metal-weight-calculator/) 直接计算任意尺寸。

## 圆棒重量表（实心钢）

实心圆棒是最简单的情形：面积 = pi/4 x d2。

| 直径 (mm) | 面积 (mm2) | kg/m |
| --- | --- | --- |
| 6 | 28 | 0.22 |
| 8 | 50 | 0.39 |
| 10 | 79 | 0.62 |
| 12 | 113 | 0.89 |
| 16 | 201 | 1.58 |
| 20 | 314 | 2.47 |
| 25 | 491 | 3.85 |
| 30 | 707 | 5.55 |
| 40 | 1,257 | 9.86 |
| 50 | 1,963 | 15.41 |
| 60 | 2,827 | 22.20 |
| 80 | 5,027 | 39.46 |
| 100 | 7,854 | 61.65 |

钢筋同样适用这张表——12 mm 钢筋每米 0.89 kg，一根 12 m 的钢筋就是 10.7 kg。

## 方管（SHS）重量表

方形空心型材要扣除内部空腔：面积 = a2 - (a - 2t)2。

| 截面 a x a x t (mm) | 面积 (mm2) | kg/m |
| --- | --- | --- |
| 20 x 20 x 2 | 144 | 1.13 |
| 25 x 25 x 2 | 184 | 1.44 |
| 30 x 30 x 2.5 | 275 | 2.16 |
| 40 x 40 x 2 | 304 | 2.39 |
| 40 x 40 x 3 | 444 | 3.49 |
| 50 x 50 x 3 | 564 | 4.43 |
| 60 x 60 x 3 | 684 | 5.37 |
| 60 x 60 x 4 | 896 | 7.03 |
| 80 x 80 x 4 | 1,216 | 9.55 |
| 100 x 100 x 4 | 1,536 | 12.06 |
| 100 x 100 x 6 | 2,256 | 17.71 |

壁厚的影响比多数人以为的更大：40 mm 方管的壁厚从 2 mm 加倍到 4 mm，重量几乎翻倍。

## 扁钢重量表

扁钢为宽 x 厚 x 0.00785。

| 宽 x 厚 (mm) | 面积 (mm2) | kg/m |
| --- | --- | --- |
| 20 x 3 | 60 | 0.47 |
| 25 x 5 | 125 | 0.98 |
| 30 x 5 | 150 | 1.18 |
| 40 x 5 | 200 | 1.57 |
| 50 x 5 | 250 | 1.96 |
| 50 x 6 | 300 | 2.36 |
| 60 x 6 | 360 | 2.83 |
| 80 x 6 | 480 | 3.77 |
| 80 x 8 | 640 | 5.02 |
| 100 x 8 | 800 | 6.28 |
| 100 x 10 | 1,000 | 7.85 |

一个便捷的验算：100 x 10 扁钢恰好重 7.85 kg/m，因为它的面积是 1,000 mm2——便于记忆：每 127 米正好 1 kg。

## 管材重量表（中系列）

管材要减去内孔：面积 = pi/4 x (OD2 - ID2)。

| 公称尺寸 | OD x 壁厚 (mm) | kg/m |
| --- | --- | --- |
| DN25 (1 in) | 33.7 x 2.6 | 2.00 |
| DN32 (1.25 in) | 42.4 x 2.6 | 2.55 |
| DN40 (1.5 in) | 48.3 x 2.6 | 2.93 |
| DN50 (2 in) | 60.3 x 2.9 | 4.10 |
| DN65 (2.5 in) | 76.1 x 3.2 | 5.75 |
| DN80 (3 in) | 88.9 x 3.2 | 6.76 |
| DN100 (4 in) | 114.3 x 3.6 | 9.83 |
| DN125 (5 in) | 139.7 x 4.0 | 13.39 |
| DN150 (6 in) | 168.3 x 4.5 | 18.18 |

把 50 mm 圆棒（15.41 kg/m）与 DN50 管材（4.10 kg/m）对比：空心截面在单位重量上的强度损失远慢于实心材料。

## 从 kg/m 到项目重量与成本

把表中数值乘以总长度即可：一个用 24 m 长 40 x 40 x 2 方管做的车间框架重 24 x 2.39 = 57.4 kg。其他金属按密度比缩放——同样的框架用铝重 57.4 x 0.344 = 19.7 kg，用黄铜重 62.2 kg。[金属重量计算器](https://nestingcalc.com/cn/metal-weight-calculator/) 会为任意截面、材料和数量完成这套算术，背后的密度比则由 [金属重量公式：碳钢、铝、不锈钢按截面计算](https://nestingcalc.com/cn/guides/metal-weight-formula/) 解释。

[金属重量计算器](https://nestingcalc.com/cn/metal-weight-calculator/) [打开线性切割计算器](https://nestingcalc.com/cn/linear-cutting-calculator/)

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