PD 6635:1999

Committees responsible
Foreword
1 Scope
2 Normative references
3 Terms and definitions
3.1 Heat analysis
3.2 Product analysis
4 Classification and designation
4.1 Classification
4.2 Designation
5 Production process
6 Common requirements
6.1 General
6.2 Internal soundness and surface quality for all types of rod
6.3 Inspection of non-metallic inclusions
6.4 Method of delivery
6.5 Delivery condition
7 Requirements for general purpose rod
7.1 Chemical composition and mechanical properties
7.2 Depth of surface defects and soundness
7.3 Core segregation
8 Requirements for rimmed and rimmed-substitute low-carbon
      steel rod
8.1 Chemical composition and mechanical properties
8.2 Depth of surface defects and soundness
9 Requirements for rod for special applications
9.1 Chemical composition and mechanical properties
9.2 Depth of surface defects and soundness
9.3 Core segregation
9.4 Depth of decarburization
10 Dimensions, mass and tolerances
11 Inspection and testing
11.1 Inspection and inspection documents
11.2 Extent of inspection
11.3 Acceptance unit and number of samples and test pieces
11.4 Test of chemical composition
11.5 Test of decarburization, surface defects, non-metallic
      inclusions and core segregation
11.6 Test methods
12 Marking
Annex A (normative) Determination of core segregation
A.1 Scope
A.2 Definition
A.3 Principle
A.4 Preparation of samples
A.5 Evaluation of the segregation
Annex B (informative) Information to be supplied by the purchaser
Figure
A.1 Five classes of segregation
Tables
1 Chemical analysis (heat analysis) for general purpose
      rod
2 Chemical analysis (heat analysis) for rimmed and
      rimmed-substitute low carbon
3 Chemical analysis (heat analysis) for rod special
      applications
4 Permissible deviations in the product analysis in
      relation to the actual heat analysis for general purpose
      rod
5 Mechanical properties for general purpose rod and rod
      for special applications
6 Limit values for the depth of surface discontinuities for
      general purpose rod
7 Permissible deviations in the product analysis in
      relation to the actual heat analysis for rimmed and
      rimmed-substitute low-carbon steel rod
8 Tensile strength values for rimmed and rimmed-substitute
      low carbon steel rod
9 Limit values for the depth of surface discontinuities for
      rimmed and rimmed-substitute low-carbon steel rod
10 Permissible deviations in the product analysis in
      relation to the actual heat analysis for rod for special
      applications
11 Limit values for the depth of surface discontinuities for
      rod for special applications
12 Limit of the depth of partial decarburization
13 Extent of inspection
14 Acceptance unit and number of samples and test pieces

Applicable to the following types of non-alloy steel rod; low carbon, low silicon, rimmed and rimmed-substitute steel with high ductility for drawing and/or cold rolling, improved characteristics intended for drawing and/or cold rolling, and for general purpose rod for drawing and/or cold rolling.