Post on 30-Dec-2015
description
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UIC 860.O vs. EN 13674-1
DB 410/04
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Standard organisation
• National committees
– AFNOR and 31 standardisation offices in France ( BNS, BNF........)
– BSI in UK
– DIN in Germany
– ASTM in USA,
– JIS in Japan, ...
• International committees
– ISO
– CEN
• Railway dedicated committees: UIC, AREMA
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Europeantrack technical committee
• CEN/TC 256/SC 1
– GT 4 : Rails and welding of rails
– GT 5 : Machines for construction and maintenance of the track
– GT 15: Parameters for track design
– GT 16: Sleepers
– GT 17: Fastening systems
– GT 18: Switches and crossings
– GT 21: Track approval
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Standards for rails and welding
• Part 1: Vignole railway rails 46 kg/m and above
• Others:
– Switch and crossing rails
– Vignole railway rails from 27 kg/m to but excluding 46 kg/m
– Aluminothermic welding
– Flash butt welding
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Content of the standards
• Normative references
• Quality system
• Production process
• Steel grades and profiles
• Qualifying tests
• Acceptance tests
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Grades
• UIC
4 grades
– 700
– 900A
– 900B
– 1100
• EN
7 grades
– R 200
– R 220
– R 260
– R 260Mn
– R 320Cr
– R 350HT
– R 350LHT
Head hardened
rails
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Chemical compositionMechanical properties
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Chemical compositionMechanical properties
Smax
Hardness
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Profiles
UIC4 profiles
Branding
UIC XX
XX = mass per meter
EN21 profiles
(Note : Euro UIC)
Branding
YY E 1, 2,
YY: mass per meter
1,2,…geometrical variant for a same mass per meter
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Computerized profile design
UIC EN
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EN profiles and previous profiles
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Branding
CORUS HY 04 60E1
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Qualifying tests
• Tensile strength
• and elongation Development of a predictive equation using multiple regression analysis
For each heat, calculation of the tensile strength and elongation
Results have to be higher than the specified values
Comparison with experimental results every 2 000 tons
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Qualifying tests
• Fracture mechanics
• Fatigue
• Residual stress
KIC: toughness.
Da/Dn: fatigue crack growth rate
Constant amplitude fatigue tests
Limitation of the residual stress in rail foot, due to the straightening
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Acceptance tests
• Chemical composition
• Microstructure
• Decarburisation
• Oxide cleanness
• Sulphur prints
• Hardness
• Tensile tests
• Dimension tolerances
• Straightness, surface flatness and twist
• Ultrasonic test requirements
• Surface quality
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Hardness
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Profile tolerances
• New requirement:
– Crown profile
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Straightness
Position Maximum amplitude EN class A EN class B UIC0.3 mm / 3 m 0.4 mm / 3 m0.2 mm / 1 m 0.3 mm / 1 m
Horizontal flatness 0.45 mm / 1.5 m 0.6 mm / 1.5 m0.4 mm / 2 m0.3 mm / 1 m0.5 mm / 2 m0.4 mm / 1 m
Whole rail Mini radius 1500 m 1500 m 1000 m
Vertical flatness
Vertical straightness
Horizontal straightness
Body
Ends
Straight according to visual inspection
0.5 mm / 1.5 m 0.7 mm / 1.5 m
0.7 mm / 1.5 m 0.7 mm / 1.5 m
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Straightness
• New requirement:
– Twist
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Ultrasonic test
100% of the the rail length
Cross-sectional area:
70% Head
60% Web
Foot
Calibration: Flat bottomed 2 mm
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Surface quality
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Conclusion
• Most commonly used standards of the world for the supply of railway rails have been reviewed during the preparation of this standard
• Modern rail production technology and the requirements of railways within the Community have demanded a completely new look at the philosophy and content
• This EN is performance based and requires manufacturers to offer the latest proven technology to consistently satisfy the demanding quality of the required product
• Guarantee is considered as a commercial aspect by CEN. Therefore, it is not included in this EN and the guarantee definition and conditions have to be written in the commercial contract