Standard No.:	YB/T 4427-2014
English Name:	General requirements for surface condition of hot-rolled sections
Chinese Name:	热轧型钢表面质量一般要求
Professional Classification:	YB    Professional Standard - Metallurgy
Source Content Issued by:	Ministry of Industry and Information Technology
Issued on:	2014-10-14
Implemented on:	2015-4-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specifies terms and definitions, classification, requirements and rounding off of numerical values for surface condition of hot-rolled steel section. This standard is applicable to general requirements of surface quality for rolled steel sections (hereinafter referred to as “sections”) such as hot-rolled H section, joist steel, channel steel, and angle steel etc. 2 Normative References The following documents are essential to the application this document. For dated references, only the dated edition is applicable to this standard; for undated references, the latest edition (including all the amendments) applies. For the undated references, the latest editions of the normative documents (including all the amendments) apply. YB/T 081 Rule for Rounding off of Numerical Values and Judgement of Testing Values for Technical Standards of Metallurgy. 3 Terms and Definitions For the purpose of this standard, the following terms and definitions apply. 3.1 imperfections surface discontinuities, other than cracks, scar, delamination and tension fracture, with the depth and (or) area less than a specified limiting value 3.2 defects cracks, scar, delamination and tension fracture, and surface discontinuities with the depth and (or) area less than a specified limiting value 4 Classification

Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Classification 5 Requirements 6 Numerical Rounding