Steel plate thickness tolerance charts
Steel plate thickness tolerance charts
The tolerance of the thickness of the steel plate refers to the difference between the thickness of the steel plate and its standard specification.
When manufacturing steel plates or steel pipes, it is limited by factory technology and has limited precision. It is impossible to roll a completely flat steel plate, and it will not be exactly the same as the nominal thickness. Therefore, the thickness of the steel plate or steel pipe produced is a range. In order to ensure the quality of steel products, and to facilitate the design of steel products such as containers, the allowable tolerance of steel thickness is specified by technical standards and specifications.
The value of the allowable tolerance of the thickness of the steel plate will be different in different standard systems, and the standard of the same system will change as the standard is updated.
Thickness negative tolerances are more and more important than positive thickness deviations. Negative thickness tolerances are used in strength design, stiffness design, and structural design. Positive tolerances are only used when equipment with higher accuracy requirements or civil infrastructure design.
The current Chinese national standard stipulates that the general thickness of the low-alloy steel plate for pressure vessels is -0.3mm, the carbon steel is -0.8mm, the negative tolerance of the thickness of the high-alloy steel hot-rolled steel plate is -0.3mm, the high-alloy steel hot-rolled steel plate And steel strips vary with steel plate thickness and accuracy grade, but the maximum is no more than -0.3mm. The negative tolerance of the thickness of the steel pipe is generally expressed as a percentage of the thickness of the standard specification. It should be noted that as the steel rolling technology advances, the standard will be updated and the value will be reduced. Therefore, it is not static.
Common steel plate thickness tolerance chart
Allowable tolerance of thickness of hot rolled steel sheet (extracted from GB/T709-1988)
Higher rolling accuracy:Thickness tolerance chart
Ordinary rolling accuracy:Thickness tolerance chart
Stainless steel composite steel plate strip size specification and tolerance (from GB/T8165-1997)
Specification
Thickness tolerance chart
Width tolerance chart
Flatness
Allowable tolerance of thickness of hot rolled steel sheet (extracted from GB/T709-1988)
Higher rolling accuracy:Thickness tolerance chart
|
Nominal thickness
(steel and steel strip) / mm
|
Thickness tolerance / mm at the following widths | ||||||
| 600～750 | ＞750～1000 | ＞1000～1500 | 1500～2000 | ＞2000～2300 | ＞2300～2700 | ＞2700～3000 | |
| ＞0.35～0.50 | ±0.05 | ±0.05 | － | － | － | － | － |
| ＞0.50～0.60 | ±0.06 | ±0.06 | － | － | － | － | － |
| ＞0.60～0.75 | ±0.07 | ±0.07 | － | － | － | － | － |
| ＞0.75～0.90 | ±0.08 | ±0.08 | － | － | － | － | － |
| ＞0.90～1.10 | ±0.09 | ±0.09 | － | － | － | － | － |
| ＞1.10～1.20 | ±0.10 | ±0.11 | ±0.11 | － | － | － | － |
| ＞1.20～1.30 | ±0.11 | ±0.12 | ±0.12 | － | － | － | － |
| ＞1.30～1.40 | ±0.11 | ±0.12 | ±0.12 | － | － | － | － |
| ＞1.40～1.60 | ±0.12 | ±0.13 | ±0.13 | － | － | － | － |
| ＞1.60～1.80 | ±0.13 | ±0.14 | ±0.14 | － | － | － | － |
| ＞1.80～2.00 | ±0.14 | ±0.15 | ±0.16 | ±0.17 | － | － | － |
| ＞2.00～2.20 | ±0.15 | ±0.16 | ±0.17 | ±0.18 | － | － | － |
| ＞2.20～2.50 | ±0.16 | ±0.17 | ±0.18 | ±0.19 | － | － | － |
| ＞2.50～3.00 | ±0.17 | ±0.18 | ±0.19 | ±0.20 | ±0.23 | － | － |
| ＞3.00～3.50 | ±0.18 | ±0.19 | ±0.20 | ±0.22 | ±0.26 | － | － |
| ＞3.50～4.00 | ±0.21 | ±0.22 | ±0.24 | ±0.26 | ±0.30 | － | － |
| ＞4.00～5.50 |
+0.10 -0.30 |
+0.15 -0.30 |
+0.10 -0.40 |
+0.20 -0.40 |
+0.25 -0.40 |
－ | － |
| ＞5.50～7.50 |
+0.10 -0.40 |
+0.10 -0.50 |
+0.10 -0.50 |
+0.20 -0.50 |
+0.25 -0.60 |
－ | － |
| ＞7.50～10.0 |
+0.10 -0.70 |
+0.10 -0.70 |
+0.20 -0.70 |
+0.20 -0.70 |
+0.25 -0.70 |
－ | － |
| ＞10.0～13.0 |
+0.10 -0.70 |
+0.10 -0.70 |
+0.20 -0.70 |
+0.30 -0.70 |
+0.35 -0.70 |
－ | － |
Ordinary rolling accuracy:Thickness tolerance chart
|
Nominal thickness
(steel and steel strip) / mm
|
Thickness tolerance / mm at the following widths | ||||||
| 600～750 | ＞750～1000 | ＞1000～1500 | 1500～2000 | ＞2000～2300 | ＞2300～2700 | ＞2700～3000 | |
| ＞0.35～0.50 | ±0.07 | ±0.07 | － | － | － | － | － |
| ＞0.50～0.60 | ±0.08 | ±0.08 | － | － | － | － | － |
| ＞0.60～0.75 | ±0.09 | ±0.09 | － | － | － | － | － |
| ＞0.75～0.90 | ±0.10 | ±0.10 | － | － | － | － | － |
| ＞0.90～1.10 | ±0.11 | ±0.12 | － | － | － | － | － |
| ＞1.10～1.20 | ±0.12 | ±0.13 | ±0.15 | － | － | － | － |
| ＞1.20～1.30 | ±0.13 | ±0.14 | ±0.15 | － | － | － | － |
| ＞1.30～1.40 | ±0.14 | ±0.15 | ±0.18 | － | － | － | － |
| ＞1.40～1.60 | ±0.15 | ±0.15 | ±0.18 | － | － | － | － |
| ＞1.60～1.80 | ±0.15 | ±0.17 | ±0.18 | － | － | － | － |
| ＞1.80～2.00 | ±0.16 | ±0.17 | ±0.18 | ±0.20 | － | － | － |
| ＞2.00～2.20 | ±0.17 | ±0.18 | ±0.19 | ±0.20 | － | － | － |
| ＞2.20～2.50 | ±0.18 | ±0.19 | ±0.20 | ±0.21 | － | － | － |
| ＞2.50～3.00 | ±0.19 | ±0.20 | ±0.21 | ±0.22 | ±0.25 | － | － |
| ＞3.00～3.50 | ±0.20 | ±0.21 | ±0.22 | ±0.24 | ±0.29 | － | － |
| ＞3.50～4.00 | ±0.23 | ±0.26 | ±0.28 | ±0.28 | ±0.33 | － | － |
| ＞4.00～5.50 |
+0.20 -0.40 |
+0.30 -0.40 |
+0.30 -0.50 |
+0.40 -0.50 |
+0.45 -0.5 |
－ | － |
| ＞5.50～7.50 |
+0.20 -0.50 |
+0.20 -0.60 |
+0.25 -0.60 |
+0.40 -0.60 |
+0.45 -0.60 |
－ | － |
| ＞7.50～10.0 |
+0.20 -0.80 |
+0.20 -0.80 |
+0.30 -0.80 |
+0.35 -0.80 |
+0.45 -0.80 |
+0.60 -0.80 |
－ |
| ＞10.0～13.0 |
+0.20 -0.80 |
+0.20 -0.80 |
+0.30 -0.80 |
+0.40 -0.80 |
+0.50 -0.80 |
+0.70 -0.80 |
+1.00 -0.80 |
Stainless steel composite steel plate strip size specification and tolerance (from GB/T8165-1997)
Specification
| Specification | The thickness of the composite steel plate is not less than 8mm, and the thickness of the composite steel strip is 4mm~8mm. |
| Composite steel plate width 1450mm ~ 3000mm, composite steel strip width 1000mm ~ 1400mm | |
| Composite steel plate and steel strip length 4000mm ~ 10000mm | |
| The thickness of the composite layer is from 0.5 mm to 14 mm, usually from 2 mm to 3 mm. It can also be determined by the supplier and the buyer according to the needs of the buyer. | |
| Minimum thickness of the base layer: When the total thickness of the composite steel plate is >8mm, the minimum thickness of the base layer is 6mm, and the minimum thickness of the base layer of the composite steel strip is agreed by the supplier and the buyer. |
Thickness tolerance chart
| Thickness tolerance | Multilayer thickness tolerance | Composite steel plate strip total thickness tolerance | ||||
| Class I, Class II | Class Ⅲ | Composite steel plate total thickness / mm | tolerance(%) | |||
| Steel strip | Steel plate | Class I, Class II | Class Ⅲ | |||
| Not more than ±9% of the nominal size of the layer, and no more than 1mm | Not more than ±10% of the nominal size of the layer, and no more than 1mm | 4～8 | — |
+10 -8 |
±9 | |
| — | ≥8～15 |
+9 -7 |
±8 | |||
| — | 16～25 |
+8 -6 |
±7 | |||
| — | 26～30 |
+7 -5 |
±6 | |||
| — | 31～60 |
+6 -4 |
±5 | |||
| — | ＞60 | Negotiate | Negotiate | |||
Width tolerance chart
| Nominal thickness / mm | Width tolerance | |||
| ＜1450 | ≥1450 | |||
| Class I | Class II | Class Ⅲ | ||
| 4～8 | According to GB709 |
+6 0 |
+10 0 |
+15 0 |
| ＞8～25 | According to GB709 |
+20 0 |
+25 0 |
+30 0 |
| ≥26 | According to GB709 |
+25 0 |
+30 0 |
+35 0 |
Flatness
| Composite steel plate total thickness / mm | Width / mm | ||
| 1000～1450 | ＞1450～1800 | ＞1800 | |
| Allowable unevenness / mm within the specified width | |||
| 4～8 | 8 | 9 | 10 |
| ＞8～25 | 10 | 14 | 15 |
| ≥26 | 8 | 12 | 14 |
