ISO 4951-1:2001 pdf download
ISO 4951-1:2001 pdf download.High yield strength steel bars and sections –
Part 1: General delivery requirements.
4.3 Delivery condition
4.3.1 Normalized steel
The delivery condition for normalized steel for bars and sections as defined in clause 3 is given in ISO 4951 -2.
4.3.2 Thermomechanical ly rolled steel
The delivery condition for thermomechanically rolled steel for bars and sections as defined in clause 3 is given in
ISO 4951 -3.
4.4 Surface condition
4.4.1 Surface appearance
The products shall have a smooth surface consistent with the rolling process used; they shall not show any defects
which may prejudice processing or their appropriate application
4.4.2 Removal of discontinuities
Surface discontinuities may be removed by the manufacturer, before despatch, by means of 9nnding. provided that the depression does not extend below the rolled surface by more than:
— 0,8 mm for material of thickness < 10 mm;
— 1,6 mm for material of thickness 10mm to 50 mm; 3 mm for material of thickness > 50 mm.
4.4.3 Repairs by welding
Unless otherwise specified, discontinuities that are greater in depth than limits specified in 4.4.2 may be removed and weld metal deposited subject to the following conditions.
a) The reduction of thickness of the material resulting from the removal of discontinuities prior to welding shall not exceed 20 % of the nominal thickness at the location of the discontinuity.
b) All welding shall be performed by competent welders using welding electrodes appropriate for the grade being repaired and shall follow welding procedures approved by the purchaser.
c) For materials supplied in the normalized condition, it shall be specifically agreed with the purchaser whether repair welding is to be carried out prior to the heat treatment.
If agreed at the time of the order, the sites of repair welds shall be carefully recorded and pointed out to the purchaser.
5 Technical requirements
5.1 Chemical composition
5.1.1 Ladle analysis
The chemical composition determined by ladle analysis shall comply with the values given in Table 1 of ISO 4951-2:2001 or ISO 4951-3:2001.
6 Inspection and testing
6.1 General
The products covered by this part of ISO 4951 are subject to specific inspection and testing in accordance with the conditions specified in clause 8 of ISO 404:1992 relating to the chemical composition and mechanical properties of the product. Verification of the chemical composition of the product is only carried out by agreement at the time of enquiry and order.
6.2 Test unit
6.2.1 General
The verification of mechanical properties shall be per cast (heat).
6.2.2 Tensile tests
A test unit shall contain products of the same form, grade and delivery condition and be from the same thickness range in accordance with Table 2 in ISO 4951-2:2001 and ISO 4951-3:2001 for the specified yield strength.
For a test unit not exceeding 50 t, one tensile test shall be carried out.
For a test unit exceeding 50 t, two tensile tests shall be carried out.
6.2.3 Impact tests
A test unit shall contain products of the same form, grade and delivery condition.
For a test unit not exceeding 50 t, one impact test shall be carried out.
For a test unit exceeding 50 t, two impact tests shall be carried out.
For product thicknesses between 6 mm and 40mm, one set of tests from the thickest product shall be carried out using subsurface specimens.
For product thicknesses exceeding 40 mm. one set of tests from the thickest product shall be carried out using specimens taken from the quarter thickness position.
6.3 PositIon and orientation of test sample
See ISO 377 and annex A.
6.3.1 Sections
The longitudinal axes of the test pieces shall be parallel to the direction of rolling.
Test samples shall be taken so that the axis of the test piece is at 1/3 from the outer edge of the half-flange (for I sections) or in the case of small sections, as near as possible to this position (see Figure A.1).
In the case of tapered flange sections, test pieces may also be taken at the outer quarter position of the web.
