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JB/T 4744-2000 PDF English

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JB/T 4744-2000: [=NB/T 47016-2011] Mechanical property tests of product welded test coupons for steel pressure vessels
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JB/T 4744-200095 Add to Cart Auto, 9 seconds. [=NB/T 47016-2011] Mechanical property tests of product welded test coupons for steel pressure vessels Obsolete

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JB/T 4744-2000: [=NB/T 47016-2011] Mechanical property tests of product welded test coupons for steel pressure vessels


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ICS 19.160 H 22 INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA NB/T 47016-2011 (JB/T 4744) Replacing JB 4744-2000 Mechanical Property Tests of Product Welded Test Coupons for Pressure Equipment ISSUED ON: JULY 01, 2011 IMPLEMENTED ON: OCTOBER 01, 2011 Issued by: National Energy Administration NB

Table of Contents

Foreword ... 3 1 Scope ... 5 2 Normative Reference ... 5 3 General Provisions ... 5 4 Coupon Preparation ... 7 6 Inspection Method and Qualified Indexes ... 10 7 Reinspection... 22 Announcement (Corrigendum) ... 24 Mechanical Property Tests of Product Welded Test Coupons for Pressure Equipment

1 Scope

This standard specifies the preparation, sample preparation, inspection method and qualified indexes for pressure equipment’s (boiler, pressure vessels and pressure piping) product welded coupons. This standard is applicable to the inspection of mechanical property and bending property for steel, aluminum, titanium, copper and nickel pressure equipment’s product welded coupons. The product welded coupons include product weld test plate, product inspection coupons, simulating loop and certification loop. This standard is not applicable to gas cylinders.

2 Normative Reference

The following referenced documents are indispensable references, only the edition cited applies. For dated references, only the dated edition of the normative reference referred to applies. For the undated normative references, the latest editions (including all amendments) apply. GB/T 228 Metallic Materials - Tensile Testing GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method GB/T 2653 Bend Test Methods on Welded Joints NB/T 47014 Welding Procedure Qualification for Pressure Equipment

3 General Provisions

3.1 In addition to the requirements of this standard, the inspection of mechanical property for product welded coupons shall also be in accordance with the relevant requirements of safety technical codes, standards and design documents. 3.2 Materials used for coupons shall be of the same standard, code (mark and steel different; three impact samples shall be taken at each side of heat affected zone. 5.4.3 Except for requirements of design documents, the composite metal shall be prepared of impact sample only at the basement layer. 5.4.4 Impact test at heat affected zone of low carbon steel, Q345R and austenitic chromium-nickel steel coupons is permissible to be omitted. 5.4.5 Aluminum magnesium alloy whose magnesium content exceeds 3% shall be prepared of impact samples only at the weld zone. 5.5 Sample position 5.5.1 The sampling position of plate sample is detailed in Figure 1; the impact sample position used for reinspection remains unchanged. 5.5.2 The sampling position of tubulous coupons is detailed in Figure 2. 5.6 The length of rejection part at both ends of coupons shall be subject to welding method and plate thickness, it shall not be less than 30mm for manual welding, and not be less than 40mm for motorized welding and automatic welding. If there are arc starting plate and run off plate, the parts at the both ends of coupon may be rejected or not. 5.7 Sample blank shall be made with cold process and hot working method but the heat affected zone shall be neglected. 5.8 After the sample inspection is qualified and marked with lines, steel seal or permanent marking shall be printed.

6 Inspection Method and Qualified Indexes

6.1 Tensile test 6.1.1 Tensile samples for joints 6.1.1.1 Sampling and processing requirements: a) Tensile samples shall be taken from the heat affected zone and each kind of weld metal of each welding method (or welding process); b) As for composite metal, where the coating thickness is involved in calculating the composite board strength, the tensile sample shall include the coating and basement layer; where the coating thickness is not involved in calculating the composite board strength, the tensile sample shall omit the coating and its weld metal; 3) The specified minimum tensile strength value of titanium base metal equals to the tensile strength lower limiting value specified in the annealed state standard; 4) The specified minimum tensile strength value of copper base metal equals to the smaller value of tensile strength lower limiting values specified in the annealed and other state standard; Where the tensile strength lower limiting value for extruding copper product specified in annealed state is not given out in standards, it can be determined according to 90% of tensile strength lower limiting value specified in original state or according to the results of experimental investigation; 5) The specified minimum tensile strength value of nickel base metal equals to the specified tensile strength lower limiting value of base metal in annealed state (only for Ni-1 and Ni -2) or solid solution condition (only for Ni -3, Ni -4 and Ni -5); b) Where the sample base metals are of two kinds of metal material codes, the tensile strength of each sample shall not be less than the smaller value of the specified minimum tensile strength values of these two base metals in this standard: c) Samples which the coating thickness is involved in calculating the design strength of composite metallic material, the tensile strength Rm of each sample shall meet: 21 2m211m m tt tRtRR   Where, Rm1 - The specified minimum tensile strength value of coating, the unit is MPa; Rm2 - The specified minimum tensile strength value of base metal, the unit is MPa; t1 - The coating thickness; T2 - The basement layer thickness d) Where weld metal is required whose room-temperature tensile strength is lower than the base metal, the tensile strength of each sample shall not be less than the specified minimum value of weld metal tensile strength. e) If break happens on the above-mentioned samples base metal which excludes the welding seam or fusion line, the tensile strength value shall not be less than 95% of the minimum value of base metal tensile strength specified in this standard; in this way the test can be regarded as qualified. 6.1.4.2 All-welded tensile test: a) The tensile strength of all-welded metal tensile sample shall not be less than the specified minimum tensile strength value of the steel base metal; b) The percentage elongation after fracture of all-welded metal tensile sample shall not be less than the smaller value of the following two values: 1) 20%; 2) 104820  , where, U refers to the minimum tensile strength value specified by welding steel base metal. 6.2 Bending test 6.2.1 Test requirement The surface in tension of bending samples shall include the heat affected zone and each kind of welding method (or welding process); 6.2.2 The form and processing of samples a) When removing the weld reinforcement of sample, cold process shall be adopted; the surface in tension of surface bending and root-bending samples shall be flush; the surface in tension of samples shall be free from scratches and damage; b) Surface bending and root-bending samples are detailed in Figure 9 and Table 3. 1) The base metal category whose number is 1 in Table 3: Where T >3mm, S=3mm; unnecessary thickness shall be removed from the sample compression face; Where T is less than or equal to 3mm, S shall be close to T as much as possible; 2) The base metal category whose number is exclusive of 1 in Table 3: Where T >10mm, S=10mm; unnecessary thickness shall be removed from the sample compression face; diameter equals AS )200(  (A refers to the specified lower limiting value of percentage elongation after fracture multiplied by 100); the spacing of supports equal to the bend center diameter plus 2S+3mm; e) When carrying out horizontal sample bending test, the weld metal and heat affected zone shall be entirely located in the bending parts of the sample. 6.2.4 Qualified indexes When the sample is bent to a specified angle, the welding seam and heat affected zone on stretching plane along any direction shall be free from crack opening defect with single length larger than 3mm, and the edge angle crack of sample shall generally not be counted, but the edge angle crack length caused by incomplete fusion, slag inclusion or other internal defects shall be counted. If adopting two or more samples, each sample shall meet above requirements. As for the composite metallic material produced by rolling method, exploded rolling method and explosion method, where there are layering and crack caused by non-combined defect of side bending sample composite interface, it is permissible to sample again for testing. 6.3 Impact test 6.3.1 As for the weld zone and heat affected zone which adopt various welding methods (or welding procedures), Charpy V test shall be carried out. 6.3.2 Sample: a) Sampling orientation: the longitudinal axis shall be vertical to the weld axis, and the Charpy V-notch axis shall be vertical to the base metal surface; b) Sampling position: the sampling position on the coupon thickness is detailed in Figure 11; c) The notch position: the notch axis of the weld zone sample shall be located on the weld center line. For the distance from the notch axis of the heat affected zone sample to the longitudinal axis and fusion line, the K is greater than zero and the crossing point shall pass through the heat affected zone as much as possible, see Figure 12. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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