BS EN 12420:2014
$198.66
Copper and copper alloys. Forgings
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 64 |
This European Standard specifies the composition, the property requirements and tolerances on dimensions and form for copper and copper alloy die and hand forgings.
The sampling procedures, the methods of test for verification of conformity to the requirements of this standard, and the delivery conditions are also specified.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | Foreword |
| 8 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Designations 4.1 Material 4.1.1 General 4.1.2 Symbol 4.1.3 Number 4.2 Material condition 4.3 Product |
| 12 | 5 Ordering information 6 Requirements 6.1 Composition |
| 13 | 6.2 Mechanical properties 6.2.1 Hardness properties 6.2.2 Tensile properties 6.3 Electrical properties 6.4 Resistance to dezincification 6.5 Residual stress level 6.6 Tolerances for die forgings 6.6.1 General |
| 14 | Figure 3 — Die forging 6.6.2 Tolerances for dimensions within the die cavity and for dimensions across the die parting line |
| 15 | Figure 4 — Area A (in mm2) = nmax × n 6.6.3 Mismatch |
| 16 | 6.6.4 Flash projection |
| 17 | Figure 10 — Flash projection 6.6.5 Ejector marks Figure 11 — Ejector marks 6.6.6 Flatness tolerances |
| 18 | Figure 12 — Dimension nmax used as reference dimension of flatness tolerance 6.6.7 Angular tolerances Figure 13 — Definition of shorter leg 6.7 Tolerances for cored forgings |
| 19 | Figure 14 — Cored forgings (products cored in the forging direction) Figure 15 — Cored forgings (products cored normally to the forging direction) 6.8 Tolerances for hand forgings 6.8.1 General |
| 20 | 6.8.2 Tolerances on dimensions Figure 16 — Dimensions t and n Figure 17 — Dimensions + a and – a 6.8.3 Flatness tolerance |
| 21 | 6.9 Surface quality 6.10 Drawings 7 Sampling 7.1 General 7.2 Analysis |
| 22 | 7.3 Hardness, stress corrosion resistance, dezincification resistance and electrical property tests 8 Test methods 8.1 Analysis 8.2 Hardness test 8.3 Electrical conductivity test 8.4 Dezincification resistance test 8.5 Stress corrosion resistance test |
| 23 | 8.6 Retests 8.6.1 Analysis, hardness, electrical conductivity and dezincification resistance tests 8.6.2 Stress corrosion resistance test 8.7 Rounding of results 9 Declaration of conformity and inspection documentation 9.1 Declaration of conformity 9.2 Inspection documentation |
| 24 | 10 Marking, labelling, packaging |
| 25 | Table 1 — Composition of copper |
| 26 | Table 2 — Composition of copper alloys, low alloyed |
| 27 | Table 3 — Composition of copper-aluminium alloys |
| 28 | Table 4 — Composition of copper-nickel alloys Table 5 — Composition of copper-nickel-zinc alloys |
| 29 | Table 6 — Composition of copper-zinc alloys, binary |
| 30 | Table 7 — Composition of copper-zinc-lead alloys |
| 31 | Table 8 — Composition of copper-zinc alloys, complex |
| 32 | Table 9 — Hardness properties for forgings of material group I |
| 33 | Table 10 — Hardness properties for forgings of material group II Table 11 — Electrical properties at 20 C |
| 34 | Table 12 — Tolerances for die forgings of material group I |
| 35 | Table 13 — Tolerances for die forgings of material group II |
| 36 | Table 14 — Tolerances for die forgings of material group III |
| 37 | Table 15 — Tolerances for die forgings of material group I Table 16 — Angular tolerances |
| 38 | Table 17 — Tolerances of cored forgings |
| 39 | Table 18 — Tolerances a and b for dimensions n and t Table 19 — Flatness tolerance |
| 40 | Table 20 — Sampling rate |
| 41 | Annex A (informative) Recommended guidelines for design A.1 Introduction A.2 General information |
| 42 | Figure A.3 — Casting: No fibre flow A.3 Guidelines for die forgings A.3.1 Drafts A.3.2 Web thicknesses |
| 43 | Table A.1 — Web thicknesses A.3.3 Side wall thicknesses Table A.2 — Side wall thicknesses |
| 44 | A.3.4 Rib design |
| 45 | Figure A.13 A.3.5 Cores |
| 46 | A.3.6 Flash |
| 47 | Figure A.18 A.3.7 Transition radii |
| 48 | Table A.4 — Minimum transition radii |
| 49 | A.3.8 Clamping lengths and clamping areas for finish machining Table A.5 — Clamping lengths for finish machining A.3.9 Design for cross-sectional shapes |
| 50 | A.3.10 Recommended machining allowances and total allowances Figure A.34 |
| 51 | Table A.6 — Machining allowances for drop or die forgings Figure A.35 — Total allowance taking into account the deviations of flatness |
| 52 | Figure A.36 — Total allowance in case of mismatch A.4 Guidelines for hand forgings A.4.1 General A.4.2 General information |
| 53 | A.4.3 Section changes and transitions A.4.4 Recommended machining allowances |
| 54 | Table A.7 — Machining allowance for hand forgings A.4.5 Total allowances per side of forging A.5 Guidelines for marking |
| 56 | Annex B (informative) Tensile properties |
| 57 | Table B.1 — Tensile properties for forgings of material group I (for information only) |
| 58 | Table B.2 — Tensile properties for forgings of material group II (for information only) |
| 59 | Table B.3 — Tensile properties for forgings of material group III (for information only) |
| 60 | Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC, Pressure Equipment Directive (PED) Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC, Pressure Equipment Directive (PED) |
| 61 | Bibliography |
