SY 5304-1987 General technical requirements for forgings for petroleum drilling machinery products

SY 5304-1987 General technical requirements for forgings for petroleum drilling and production machinery products SY5304-1987 standard download decompression password: www.bzxz.net

Ministry of Petroleum Industry of the People's Republic of China Standard SY5304-87
This standard was confirmed to remain valid in 1998, hereby stated. Forgings for petroleum drilling and production machinery products
General technical conditions
Published on April 18, 1988
Ministry of Petroleum Industry of the People's Republic of China
Implementation on June 1, 1988
Ministry of Petroleum Industry of the People's Republic of China Standard SY 6304-87
General technical conditions for forgings for petroleum drilling and production machinery products 1 Subject content and applicable scope
This standard specifies the general technical requirements for steel forgings. This standard applies to carbon steel and alloy steel forgings made by free forging and die forging in petroleum machinery products. 2 Reference standards
GB 899
GB 700
GB 3077
GB 1591
GB 223
GR 228
GB 231
JB4249
JB4250
3 Technical requirements
3.1 Forgings
《High-quality carbon structural steel grades and general technical conditions》 & ordinary carbon steel grades and general technical conditions》《Technical conditions for alloy structural steel》
《Technical conditions for low-alloy structural steel》
《Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products》《Determination and chemical analysis methods of elements in steel and alloys》《Metal tensile test method》
《Charpy (U-notch) impact test method for metal materials》《Metal Brinell hardness test method》
《Machining allowance and tolerance of steel free forgings on hammer》《Machining allowance and tolerance of steel die forgings on hammer》3.1.1 Steel for forgings shall comply with the provisions of GB699, GB700, GB3077 and GB1591. 3.1.2 Forgings can be made of steel ingots, but the steel ingots should be killed steel, and the furnace number must be indicated and a certificate of inspection must be attached. Forgings can also be made of hot-working rolled materials or steel bars converted from steel ingots. These steels must have a factory certificate of inspection. 3.1.3 Steels without certificates of inspection must be inspected according to relevant standards and can only be used after passing the inspection. 3.2 Forgings
3.2.1 Before forging, the surface defects on the steel that affect the quality of the forgings should be completely removed. 3.2.2 When forging with steel ingots, the loose parts at both ends of the forging must be removed, and the removal should ensure that the forgings do not have residual shrinkage holes, etc. 3.2.3 Forging ratio of forgings
a: When shaft forgings are directly forged from steel ingots, the forging ratio of the main section shall not be less than 3, and the flange or other protruding parts shall not be less than 1.75. When forged from section steel or steel, the main section shall not be less than 1.5, and the flange or other protruding parts shall not be less than 1.3. b. The forging ratio of ring forgings shall generally not be less than 3. c. When disc forgings are directly forged from steel ingots, the forging ratio shall not be less than 3. In other cases, the forging ratio shall be greater than 3, but the last process shall be greater than 2.
d. Other types of forgings can be carried out according to the contract provisions and the manufacturer's process regulations. Approved by the Ministry of Petroleum Industry of the People's Republic of China on April 18, 1988, 198B-06-01 for implementation
SY 5304-87
3.2.4 The heating and cooling of the rough pieces during the production of forgings, the initial forging and final forging temperatures shall be carried out in accordance with the manufacturing process specifications, and technical records shall be made for the important forgings determined.
3.2.5 Forgings shall be subjected to hot plastic forming on equipment with sufficient energy to ensure that the metal on the entire cross section is forged through. 3.2.6 Gas cutting may be used to form a part of the forging. 3.3 Heat treatment
3.3.1 Heat treatment of forgings shall be carried out in accordance with the manufacturer's process specifications. 3.3.2 Forgings shall be straightened when the deformation caused by heat treatment exceeds the tolerance range. After straightening in cold or semi-cold state, forgings of W and V grades shall be tempered to eliminate stress. Whether forgings of I, II and III grades need to be tempered shall be determined by the manufacturer. After straightening or tempering, forgings shall meet the mechanical property requirements (see Table 1 for the classification of forgings). 3.4 Chemical composition
3.4.1 The chemical composition of steel for forgings shall be based on the results of the analysis of samples of the same smelting furnace number, and its content shall comply with the provisions of the current national and departmental standards.
3.4.2 When it is necessary to verify the chemical composition of forgings, it can be carried out in accordance with the relevant provisions of GB222 and GB223. 3.5 Mechanical properties
3.5.1 The mechanical properties of forgings shall meet the requirements of the room temperature mechanical properties of the corresponding steel grade of forgings. 3.5.2 Forging classification test
Forgings are divided into five grades according to design requirements, working characteristics and uses, and according to the test items and the number of tests conducted (see Table 1). Table 1
Required to be measured
Mechanical properties indicators
No test
HB.o, or ab
Number of test items
5% of each batch, but
not less than 5 pieces
Test piece by piece
Test piece by piece
More than 2 pieces of each batch, but
not less than 2 pieces
Test piece by piece
Note: In the same batch of forgings, it is allowed to have forgings with similar shapes and sizes forged by different drawings. Punch
2% of each batch, but!
No less than 2 pieces
Conditions for a batch
Same steel grade, same:-heat treatmentwww.bzxz.net
Specification
Same smelting heat, same-
heat treatment heat
The test level of forging should be indicated in the drawing and order contract. If there is no clear stipulation, it shall be treated as level I. Marking example: 3.5.3
Level I test-SY× × × ×
(Additional test items and technical requirements)3.6 Appearance quality
3.6.1 The shape and size of forgings shall comply with the provisions of the forging drawing. 3.6.2 The machining allowance, tolerance and allowance specified on the forging drawing shall be implemented in accordance with IB4249 and JB4250 and related standards. 3.6.3 Burrs are not allowed on the non-machined surface of forgings. The remaining burrs on the machined surface shall be less than 2mm after removal. 3.6.4 Misalignment of the parting surface of the die forgings,
For forgings with the parting line on the machining surface, the misalignment shall not exceed 1/3 of the machining allowance. 2
SY 5304—87
For forgings with the parting line on the non-working surface, the misalignment shall comply with the provisions of Table 2. Table 2
Working length
>50～120
>120~260
>260～500
Maximum false height (original length)
Maximum allowable misalignment
If there are defects such as cracks, folds, forging scratches, interlayers, blisters, slag inclusions, etc. on the forging surface, the following provisions may be implemented 3.6.5
a. For the surface to be processed, if the defect depth does not exceed 1/2 of the single-side allowance and it is guaranteed that it can be completely eliminated after processing, it may not be removed. b. Local defects on non-machined surfaces should be removed and smoothly transitioned, and the depth should not exceed the minimum solid size at that location. C. If the depth of the surface defect of the forging exceeds the above provisions, it is allowed to perform explosive repair if the depth does not exceed 15% of the wall thickness at that location and is not greater than 10m, and the area does not exceed 20% of the surface where it is located without affecting the performance. 3.7 Forgings shall not have white spots
When self-spots are found on a forging, all forgings of the same smelting furnace and the same heat treatment furnace as the forging shall be inspected for white spots piece by piece.
4 Test methods and acceptance rules
4.1 The quality of forgings shall be inspected and accepted by the quality inspection department of the manufacturer. 4.2 All forgings shall be inspected for appearance quality, and generally visual inspection is used to check whether their surface conditions meet the requirements. 4.3 Mechanical property test
4.3.1 The mechanical property test of forgings shall be carried out after heat treatment, and the inspection items shall be carried out in accordance with the provisions of Article 3.5.2. 4.3.2 Test methods for mechanical properties,
Tensile test shall be conducted in accordance with GB228: impact test shall be conducted in accordance with GB229, and hardness test shall be conducted in accordance with GB231. 4.3.3 The placement of forging test blocks must ensure that they can represent the mechanical properties of the forgings. When it is inconvenient to retain test blocks for forgings, separate test blocks can also be made from materials from the same smelting furnace, but the separate test blocks should have the same forging process and forging ratio as the forgings, and be heat treated in the same furnace. Forgings can also be destroyed for sampling.
4.3.4 The method of cutting the sample shall be determined according to the requirements of the drawings. When there is no clear timing, it can be determined by the manufacturer. 4.3.5 Sampling location
a. For circular solid forgings, the sample shall be cut at the radius / from the surface. b. For rectangular solid forgings, the sample shall be cut at the diagonal /e. c. For hollow forgings, the sample shall be cut at /: wall thickness.
d. Forging specimens with one end solid and the other end hollow should be cut as hollow forgings. 4.3.6 Number of samples
One tensile test specimen and three impact test specimens can be taken from each test block. 4.3.7 Repeated test
When the test results of mechanical properties are unqualified, the test can be repeated with double samples. If one sample is still unqualified, the forging represented by the sample should be reheat treated together with the spare sample, and the number of repetitions of the test for new forgings shall not exceed three times. 3
4.4 White spot inspection
$Y5304—87
When inspecting white spots, a low-boring inspection can be made on the cut test block or an ultrasonic inspection can be made on the forging, and a fracture inspection can be carried out if necessary. 4.5 Chemical analysis inspection shall be carried out in accordance with Article 3.4. 4.6
Other inspection items can be carried out according to the requirements of the user or technical documents and the provisions of the current national standards and departmental standards. 5 Marking and quality certificate
5.1 Forgings that have passed the inspection shall be marked in a prominent position. 5.2 Forgings that pass the inspection shall be accompanied by a certificate of quality and profit, the contents of which are: a. Manufacturer name, b. Drawing number and part name, e. Hoe number, smelting furnace number, d. Chemical composition, various inspection results and test number, e. Heat treatment state, f. Number and weight of forgings, 9. This standard number and contract number. Additional remarks: This standard was proposed by Shirun Industrial Standardization Committee. This standard was drafted by Baoji Petroleum Machinery Factory. The main drafter of this standard is Wei Chanqi. This standard is still valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.
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