EN 10163-2-1991 pdf download.Delivery requirements for surface condition of hot rolled steel plates, wide flats and sections — Part 2: Plate and wide flats.
This Part 2 in addition to Part 1 specifies the delivery requirements which apply to the surface quality of hot rolled plates and wide flats with thicknesses of 3 mm e 250 mm.
NOTE For plates with a thickness> 250 mm special agreements should be made at the time of enquiry and order.
2 Normative references
EN 10029, Hot -rolled plates 3 mm thick or above; Tolerances on dimensions, shape and mass. EN 10051, C’ont in uously hot-rolled uncoated plate, sheet and strip of non-alloy and alloy steel; Tolerances on dimensions and shape. EURONORM 91 , Hot-rolled wide flats, Tolerances on dimensions, shape and mass.
3 General
3.1 The surface requirements and repair conditions are subdivided into 2 classes and each class is further subdivided into 3 subclasses.
Class A The surface condition shall comply with the requirements of 4.2 and
5.1.1
The remaining thickness of the affected area under discontinuities and of repaired ground areas may be less than the minimum thickness as specified in the appropriate tolerance standard.
Class B The surface condition shall comply with the requirements of 4.3 and 5.1.2
The remaining thickness of the affected area under discontinuities and of repaired ground areas shall not be less than the minimum thickness as specified in the appropriate tolerance standard.
Subclass I Repair by chipping andlor grinding followed by welding is permitted in compliance with 5.2.1
Subclass 2 Repairs by welding is only permitted if agreed at the time of enquiry and order and under agreed conditions (see 5.2.2)
Subclass 3 Repair by welding is not allowed.
The required class and subclass is specified in the appropriate material or product standard. If this is not the case the class and subclass shall be class A and subclass I unless otherwise specified at the time of enquiry and order.
3.2 If the purchaser needs to be sure that all discontinuities visible to the naked eye have been identified, assessed and where necessary repaired before delivery, products should be ordered descaled (see clause 3. Part I).
4 Requirements
4.1 General
Plates and wide flats may have surface discontinuities. which may be divided into categories depending on their nature, depth and number as defined in 4.2 and 4.3.
4.2 Class A
4.2.1 imperfections
4.2.1.1 Discont.inuities other than cracks, shell and seams (see 4.2.2.3) not exceeding the limits of Table I are regarded as being inherent of the manufacturing process and are permissible irrespective of their number.
A surface area with a remaining thickness under the discontinuities less than the minimum thickness as specified in EN 10029, EN 10051 and EURONORM 91 is permissible with a maximum of 15% of the inspected surface.
4.2.1.2 Discontinuities other than cracks, shell and seams (see 4.2.2.3) with a depth exceeding the limits of Table 1 but not exceeding the limits of Table 2 and of which the sum of the affected areas does not exceed 5 % of the inspected surface, may be left unrepaired.
4.2.2 Defects
4.2.2.1 Discontinuities with a depth not exceeding the limits of Table 2, but with an affected surface area of more than 5 % of the inspected surface shall be repaired.
4.2.2.2 Discontinuities with a depth exceeding the limits of Table 2 shall be repaired irrespective of their number.
4.2.2.3 Discontinuities such as cracks, shell and seams which are in general deep and sharp, and therefore impair the use of the products, shall always be repaired irrespective of their depth and number.
4.3 Class B
The requirements of 4.2.1 and 4.2.2 apply except that the remaining thickness under the discontinuities and repair ground areas shall not be less than the minimum permissible thickness as specified in the appropriate European Standards or EURO NORM S specifying tolerances.
5 Repair procedures
5.1 Grinding
The producer shall be allowed to repair the entire surface by grinding to the minimum thickness specified in the appropriate European Standards or EURONORMS specifying the dimensional requirements.
Grinding of defects shall be carried out subject to the following conditions.EN 10163-2-1991 pdf download.
EN 10163-2-1991 pdf download
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