GB/T 13401-2017 PDF English
US$315.00 · In stock · Download in 9 secondsGB/T 13401-2017: Steel buttwelding pipe fittings - Technical specification Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 13401: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 13401-2017 | English | 315 |
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Steel buttwelding pipe fittings - Technical specification
| Valid |
| GB/T 13401-2005 | English | 949 |
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6 days
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Steel plate butt-welding pipe fittings
| Valid |
| GB/T 13401-1992 | English | 839 |
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6 days
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Steel plate butt-welding pipe fittings
| Obsolete |
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GB/T 13401-2017: Steel buttwelding pipe fittings - Technical specification---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT13401-2017
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
Forewor
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
3 Order content
The purchaser shall provide the following information required for the purchase
of pipe fittings in the order.
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.
4.2 The contents represented by pipe fitting material level codes are as follows.
4.3 See Annex B for the commonly used raw materials for manufacturing pipe
fittings. Although this Standard does not restrict the use of raw materials other
than Annex B, the raw materials used shall meet the requirements of GB/T
20801.2 or relevant specifications.
4.4 For welded pipe fittings made of plate metal, the welding materials used are
selected according to NB/T 47015 or related specifications. For stainless steel
welded pipe fittings, the weld metal shall be subjected to chemical composition
analysis according to the batch number of the welding material.
5 Manufacturing
5.1 Pipe fittings can be formed by one or a combination of methods such as
extrusion, pushing, molding, drawing, forging, welding or cutting.
5.2 Hollow round pipe fittings less than or equal to DN100 can be directly
machined from bars. The axial direction shall be roughly parallel to the metal
fiber direction of the material. But elbows, tees and crosses shall not be directly
cut and formed from bars.
5.3 The welded pipe fittings manufactured by the pipe fitting manufacturer shall
meet the following conditions.
5.4 The number and arrangement of welds for welded pipe fittings are as follows.
5.5 In addition to the provisions of 5.6, when a pipe fitting needs to be made of
two or more plates, it shall use plates with the same furnace number.
6 Heat treatment
6.1 In addition to the provisions of 6.3, 6.5 and 6.6, all pipe fittings that have
been cold-formed, hot-formed or welded shall be heat treated according to the
material, wall thickness and other factors.
6.3 When the following conditions are met, heat treatment is not necessary.
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.
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.
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).
7.1.2 Tensile test
7.1.2.1 Each batch of pipe fittings shall be subjected to tensile test. The test
method is in accordance with GB/T 228.1.The results of the tensile test shall
meet the requirements of Table 3.
7.1.2.2 When the pipe fitting is a welded structure, another tensile test shall be
carried out on the welded joints (not including the stub end made in 5.6). The
tensile strength of the welded joint shall not be less than the minimum value of
the tensile strength specified by the corresponding material level.
7.1.3 Impact test
7.1.3.1 For low temperature steel pipe fittings and carbon steel pipe fittings with
material levels of CF415K and CF485K, each batch shall be subjected to impact
test. The test methods are in accordance with GB/T 229.The test temperature
and shock absorption energy shall meet the requirements of Table 3.
7.1.4 Hardness test
7.1.5 Reheat treatment
When the mechanical performance test or reinspection fails, it is allowed to
conduct reheat treatment to this batch of pipe fittings before test. But the
number of reheat treatment shall not exceed twice.
7.2 Shape, size and appearance
7.2.1 The pipe fittings shall have the correct appearance. The shape shall be
symmetrical. All arcs shall transit smoothly. There shall be no plane in any part
of the arc.
7.3 Non-destructive testing
7.3.1 Tees, crosses, press-formed reducers of all materials and pipe caps that
are directly cut and formed by bar materials shall be subjected to non-
destructive testing piece by piece.
7.3.2 Except for the varieties mentioned in 7.3.1, other pipe fittings of alloy steel
category (including pipe fittings of material level LF450K3 and LF680K4 in the
low temperature steel category) shall be subjected to magnetic particle
inspection piece by piece according to NB/T 47013.4 or relevant specifications.
Level I is conforming.
8 Welding repair
8.1 When the surface defect of base material of pipe fittings does not exceed
the following requirements, it can be repaired by welding.
8.2 Before welding repair, defects shall be removed by cutting, shoveling or
grinding. According to the material, carry out magnetic particle testing or
penetration testing on the removed part, so as to ensure complete removal of
defects.
8.3 During welding repair, welding consumables that match the base metal shall
be selected.
8.4 After welding repair, the repaired surface shall be trimmed by cutting or
grinding. The trimmed part shall be smoothly transitioned to the pipe fitting
surface.
8.5 Alloy steel, low-temperature steel and stainless steel pipe fittings shall be
subjected to corresponding heat treatment after welding repair.
9 Surface protection and packaging
9.1 Unless otherwise specified, for pipe fittings of carbon steel, alloy steel and
low temperature steel, anti-rust paint shall be applied to the outer surface
(excluding welding groove). Stainless steel pipe fittings shall be pickled and
passivated.
9.3 Welding grooves shall be protected by suitable methods to prevent knocks.
9.4 Pipe fittings shall be packed separately according to different material levels.
Take moisture-proof measures. Packing list shall be enclosed in the packing
box.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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