TB/T 3395.2-2015 English PDF (TBT3395.2-2015)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click TB/T 3395.2-2015
Historical versions: TB/T 3395.2-2015
Preview True-PDF (Reload/Scroll if blank)

TB/T 3395.2-2015: Fastening systems for high-speed railway Part 2: Type Ⅳfastening system
TB/T 3395.2-2015
TB
RAILWAY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.080
S 11
Fastening systems for high-speed railway -- Part 2: Type IV
fastening system
ISSUED ON: JULY 15, 2015
IMPLEMENTED ON: FEBRUARY 01, 2016
Issued by: National Railway Administration
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Fastening system composition ... 5
4 Assembly performance ... 6
5 Technical requirements for parts ... 7
6 Inspection methods ... 12
7 Inspection rules ... 20
8 Marking and packaging ... 23
9 Storage and transportation ... 24
10 Laying and maintenance ... 24
Annex A (normative) Test method for fastening pressure of elastic strips ... 25
Annex B (normative) Test method for residual deformation of elastic strips ... 29
Annex C (normative) Test method for fatigue performance of elastic strips ... 32
Annex D (informative) Laying, maintenance and repair for type IV fastening system
... 35
Fastening systems for high-speed railway -- Part 2: Type IV
fastening system
1 Scope
This Part specifies fastening system composition, assembly performance, technical
requirements for parts, inspection methods, inspection rules, marking and packaging,
as well as storage and transportation for type IV fastening system.
This Part is applicable to type IV fastening system for ballasted tracks of high-speed
railways.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 224, Determination of the depth of decarburization of steels
GB/T 230.1, Metallic materials -- Rockwell hardness test -- Part 1: Test method
GB 443-1989, Lubricating oils for total loss systems L-AN
GB/T 528, Rubber, vulcanized or thermoplastic -- Determination of tensile stress-
strain properties
GB/T 531.1, Rubber, vulcanized or thermoplastic -- Determination of indentation
hardness -- Part 1: Durometer method (Shore hardness)
GB/T 1222, Spring steels
GB/T 1348, Spheroidal graphite iron castings
GB/T 1412, Pig iron used for spheroidal graphite cast iron
GB/T 1690, Rubber, vulcanized or thermoplastic -- Determination of the effect of
liquids
GB/T 2828.1, Sampling procedures for inspection by attributes -- Part 1: Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3398.2, Plastics -- Determination of hardness -- Part 2: Rockwell hardness
There shall be no burrs and nicks in elastic strips that affect assembly. There shall be
no obvious creases and folds in the small rounded part of the tail.
5.1.4 Cracks
There shall be no cracks on the surface of the elastic strip.
5.1.5 Hardness
The hardness of the elastic strip shall be 44 HRC ~ 48 HRC.
5.1.6 Metallographic structure
The metallographic structure of the elastic strip shall be uniform tempered troostite and
tempered sorbite. A small amount of discontinuous ferrite is allowed in the core, and it
shall meet the requirements of TB/T 2478.
5.1.7 Decarburization layer
The total decarburization depth of the elastic strip shall not be greater than 0.20 mm.
5.1.8 Fastening pressure
The fastening pressure of the elastic strip shall not be less than 11.0 kN.
5.1.9 Residual deformation
After the elastic strip has passed the residual deformation test, the residual deformation
shall not be greater than 1.0 mm.
5.1.10 Fatigue performance
The elastic strip shall not be broken after 5×106 fatigue tests. The residual deformation
shall not be greater than 1.0 mm.
5.1.11 Anti-rust performance
The surface of the elastic strip shall be treated with antirust. After the anti-rust treatment,
the protection level of the elastic strip shall not be lower than level 5 after the 120h
neutral salt spray (NSS) test.
5.2 JA, JB elastic strips
5.2.1 Raw material
The raw material of the elastic strip is 60Si2MnA or Φ18 mm hot-rolled spring steel
with high performance. The performance of raw materials shall comply with the
provisions of GB/T 1222.
5.2.2 Type size
The type size of the elastic strips shall meet the design requirements.
5.2.3 Fastening pressure
The fastening pressure of elastic strips shall not be less than 8.0 kN.
5.2.4 Appearance, cracks, hardness, metallographic structure and total
decarburization
The appearance, cracks, hardness, metallographic structure and decarburization layer
of elastic strips shall meet the requirements of 5.1.3, 5.1.4, 5.1.5, 5.1.6 and 5.1.7
respectively.
5.3 Embedded iron seat
5.3.1 Raw material
The material of the embedded seat is QT 450-10. The properties of pig iron for ductile
iron shall comply with the provisions of GB/T 1412.
5.3.2 Type size
The type size of the embedded iron seat shall meet the design requirements.
5.3.3 Appearance
The appearance of the embedded iron seat shall comply with the provisions of GB/T
1348. The riser position shall be set at the buried end. Protrusion is not greater than 5
mm. The burr on the alignment line above the sleeper surface shall not be greater than
0.5 mm. The burrs on the parting line below the sleeper surface shall not be greater than
2 mm. All remaining burrs shall be removed.
5.3.4 Mechanical properties
The tensile strength and elongation after fracture of the embedded iron seat shall
comply with the provisions of GB/T 1348.
5.3.5 Metallographic structure
The spheroidization level of the embedded iron seat shall not be lower than level 3.
5.4 Insulated gauge block
5.4.1 Raw material
The raw material of insulating gauge blocks is glass fiber reinforced polyamide 66 or
other materials whose properties are not inferior. The physical and mechanical
Visually inspect the appearance of elastic strips. Use a round rod with a diameter of
17.5 mm to check the small arc at the end of the elastic strip. Any contact position
between the round rod and the inner side of the small arc shall be tangent.
6.1.3 Inspection of cracks
The surface crack inspection of elastic strips shall be carried out according to GB/T
15822.1.
6.1.4 Hardness inspection
The hardness test of elastic strips shall be carried out according to GB/T 230.1. The
sampling site of the test piece is the middle part of the middle limb of the elastic strip
(cutting length is about 20 mm ~ 30 mm). Test four points within the range from the
center of the specimen section to 1/2 radius. The reading accuracy is not less than 0.5
HRC. Take the average of the last three points.
6.1.5 Inspection of metallographic structure
The metallographic structure test of elastic strips shall be carried out according to TB/T
2478. The sampling location of the test piece is the same as 6.1.4.
6.1.6 Inspection of decarburization layer
The decarburization layer test of elastic strips shall be carried out according to GB/T
224. The sampling location of the test piece is the same as 6.1.4.
6.1.7 Fastening pressure test
The fastening pressure test of elastic strips shall be carried out according to Annex A.
6.1.8 Residual deformation test
The residual deformation test of elastic strips shall be carried out according to Annex
B.
6.1.9 Fatigue performance test
The fatigue performance test of elastic strips shall be carried out according to Annex C.
6.1.10 Anti-rust performance test
The sal...