The old BS1470 standard has been replaced by nine EN standards:
EN485-1: Technical conditions for inspection and delivery
EN485-2: Mechanical Properties
EN485-3: Tolerances for HOT Rolled Material
EN485-4: Tolerances for COLD Rolled material
EN515: Temper Designations
EN573-1: Numerical alloy designation system
EN573-2: Chemical symbol designation system
EN573-3: Chemical Compositions
EN573-4: Product forms in different alloys
For those familiar with the old BS1470 it is useful to highlight where the new EN standards differ:
• Chemical Compositions – No Change.
• Alloy Numbering System – No Change.
• Temper Designations for Heat Treatable Alloys – A new wider range of special tempers having up to four digits after the T have been introduced for non-standard applications (e.g. T6151).
• Temper Designations for Non Heat Treatable Alloys – No change to existing tempers but a more comprehensive definition of how tempers are achieved.
Soft (O) temper is now classified H111 and an intermediate temper H112 is introduced.
For alloy 5251 tempers are now shown as H32/H34/H36/H38 (equivalent to H22/H24, etc). H19/H22 & H24 are now shown separately.
• Mechanical Properties – Similar but not identical. Also, 0.2% Proof Stress must now be quoted on test certificates.
• Thickness Tolerances – Considerably tighter for alloys 1050A & 3103. To reflect manufacturing difficulty the tolerances for alloys 5251, 5083 & 6082 are now wider than this, although still a little tighter than in BS1470.
• Length and Width Tolerances – These tend to be tighter and are now all on the plus side (i.e. minus zero).
• Flatness Tolerances – These are considerably tighter.
This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with temper, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company is respect of any action taken by any third party in reliance thereon.
As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.
Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the Company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.