GB/T 13401-2017 English PDF (GBT13401-2017)

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GB/T 13401-2017: Steel buttwelding pipe fittings -- Technical specification
GB/T 13401-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040.60
J 15
Partially replacing GB/T 12459-2005, GB/T 13401-2005
Steel buttwelding pipe fittings - Technical
specification
ISSUED ON: FEBRUARY 28, 2017
IMPLEMENTED ON: SEPTEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Order content ... 6 
4 Materials ... 7 
5 Manufacturing ... 8 
6 Heat treatment ... 12 
7 Inspection and testing ... 14 
8 Welding repair ... 23 
9 Surface protection and packaging ... 24 
10 Product quality certificate ... 24 
Annex A (normative) ... 26 
Additional requirements ... 26 
Annex B (informative) Raw materials to manufacture pipe fittings ... 28 
Steel buttwelding pipe fittings - Technical
specification
1 Scope
This Standard specifies technical requirements such as order content, materials,
manufacturing, heat treatment, inspection and testing, welding repair, surface
protection and packaging, and product quality certificate for steel buttwelding
pipe fittings (hereinafter referred to as pipe fittings).
This Standard is applicable to pipe fittings specified in GB/T 12459. Other pipe
fittings may refer to this Standard for use.
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 150.4-2011, Pressure Vessels - Part 4: Fabrication, inspection and
testing, and acceptance
GB/T 222, Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 223 (all parts), Iron, steel and alloy - Chemical analysis methods
GB/T 228.1, Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 229, Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 2975, Steel and Steel Products - Location and Preparation of Test
Pieces for Mechanical Testing
GB/T 4334, Corrosion of metals and alloys - Test methods for intergranular
corrosion of stainless steels
GB/T 4336, Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine
method)
b) Material level of pipe fittings (see 4.2);
c) Nominal size (standard or designated; when the outer diameter is selected
as GB/T 12459 series II, it shall be marked "-II"), nominal wall thickness
(see 4.2.2 of GB/T 12459-2017);
d) Structure, seamless or welded (if not specified, the fitting manufacturer
can choose any kind);
e) Product standard number, GB/T 12459 and GB/T 13401 (including version
number);
f) Number of pieces;
g) Required additional requirements (see Annex A) or supplementary
requirements.
4 Materials
4.1 The raw materials for manufacturing pipe fittings include seamless pipes,
straight seam electrofusion welded pipes, plates, bars and forgings. The
chemical composition shall meet the requirements of Table 1. The pipe fitting
manufacturer shall conduct chemical composition analysis of the raw materials
used according to the melting furnace number. Analysis method is according to
GB/T 223 or GB/T 4336, GB/T 11170, to ensure that it meets the requirements
of Table 1. The allowable deviation of chemical composition analysis of the
finished product shall meet the requirements of GB/T 222.
4.2 The contents represented by pipe fitting material level codes are as follows:
a) CF is the abbreviation of carbon steel fitting, that is, carbon steel pipe
fitting. The following number is the minimum tensile strength of pipe fitting.
The letter K in the suffix represents that the level must be guaranteed to
pass the impact test at 20°C.
b) AF is the abbreviation of alloy steel fitting, that is, alloy steel pipe fitting.
The following figures use characteristic figures familiar in the industry. The
letter G in the suffix indicates that the level has higher tensile properties.
c) LF is the abbreviation of low temperature steel fitting, that is, low
temperature steel pipe fitting. The following number is the minimum tensile
strength of the pipe fitting. The suffix letters K1, K2, K3 and K4 represent
the lowest operating temperature at -20°C, -46°C, -100°C and -196°C
respectively.
d) SF is the abbreviation of stainless steel fitting, that is, stainless steel pipe
6.3 When the following conditions are met, heat treatment is not necessary:
a) Carbon steel pipe fittings (excluding carbon steel pipe fittings in low-
temperature steel) that thermoforming and final forming temperature is
between 700°C~980°C and are placed in still air and cooled;
b) Forged carbon steel pipe fittings (excluding carbon steel pipe fittings in
low-temperature steel) that are less than or equal to DN100, the final
forming temperature is between 700°C~980°C and are placed in still air
and cooled;
c) Pipe fittings manufactured by direct cutting using raw materials that have
been heat treated before exiting the factory.
6.4 For carbon steel welded pipe fittings with a nominal wall thickness greater
than 19mm and welded after thermoforming (excluding carbon steel pipe fittings
in low-temperature steel), if the requirements of 6.3a) are met, it can adopt post-
weld stress relief heat treatment.
6.5 For carbon steel welded pipe fittings with a nominal wall thickness less than
or equal to 19mm and welded after thermoforming (excluding carbon steel pipe
fittings in low-temperature steel), if the requirements of 6.3a) are met, after
negotiation between the supplier and the purchaser, it may not conduct
thermoforming. However, the suffix letters -NH shall be added after the delivery
document and the material level of pipe fittings marked by physical object, such
as CF415K-NH.
6.6 For austenitic stainless steel pipe fittings, after negotiation between the
supplier and the purchaser, thermoforming is not required. However, the suffix
letters -NH shall be added after the delivery document and the material level of
pipe fittings marked by physical object, such as SF304-NH.
6.7 The heat treatment furnace shall be equipped with an automatic
temperature measuring and recording device. A complete record can be
obtained. The effective heating zone of the heat treatment furnace is measured
according to the regulations of GB/T 9452. The temperature uniformity of the
effective heating zone is ±14°C.
7 Inspection and testing
7.1 Mechanical properties
7.1.1 Sample of mechanical properties
7.1.1.1 The sample shall be prepared from the pipe that has been heat treated
(or is formed without heat treatment). It can also be obtained from the sample
inspection piece by piece according to NB/T 47013.4 or relevant specifications.
Level I is conforming.
7.3.3 In addition to the provisions of 7.3.5, when the weld of the welded pipe
fitting is completed by the pipe fitting manufacturer, the full length of welds of
welded pipe fittings shall be inspected according to NB/T 47013.2 or relevant
specifications. Level II is conforming (excluding stud end manufactured in the
method in 5.6).
7.3.4 In addition to the provisions of 7.3.5, for welded pipe fittings made of
...