关于印发自治区促进二手车便利交易实施方案的通知
百度 （上官正）
ISO 657 (hot-rolled steel sections) is an ISO standard that specifies the tolerances for hot-finished circular, square and rectangular structural hollow sections and gives the dimensions and sectional properties for a range of standard sizes.
This first edition as an International Standard constitutes a technical revision of ISO Recommendation R 657-1:1968. ISO 657 consists of 21 parts integrating any shapes of sections. ISO 657-1 specifies dimensions of hot-rolled equal-leg angles.
Amendments
[edit]- ISO 657-2:1989
- ISO 657-5:1976
- ISO 657-11:1980
- ISO 657-14:2000
- Revisions
- ISO/DIS 12633-2
- ISO 657-14:1982
- Revisions
- ISO 657-15:1980
- ISO 657-16:1980
- ISO 657-18:1980
- ISO 657-19:1980
- ISO 657-21:1983
References
[edit]
 | This computing article is a stub. You can help Wikipedia by expanding it. |
 | This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it. |