Water delivery pressure PN10 and ring stiffness S8 grade nodular cast iron pipe product for water delivery

Abstract

The invention belongs to the technical field of nodular cast iron pipe machining, and particularly relates to a nodular cast iron pipe product for water delivery with the water delivery pressure PN10 and the ring stiffness S8 grade. Comprising the following components in percentage by mass: 3.3 wt%-3.6 wt% of C, 2.2 wt%-2.8 wt% of Si, not more than 0.06 wt% of P, not more than 0.04 wt% of S, not more than 0.3 wt% of Mn, 0.05 wt%-0.07 wt% of Mg, not more than 0.05 wt% of Ti, not more than 0.04 wt% of Ni, not more than 0.03 wt% of Cu, not more than 0.03 wt% of Cr, not more than 0.03 wt% of V, not more than 0.03 wt% of Al, not more than 0.02 wt% of Sb, not more than 0.02 wt% of Sn, not more than 0.02 wt% of Zn, not more than 0.01 wt% of Pb, not more than 0.01 wt% of Mo, not more than 0.01 wt% of As, not more than 0.01 wt% of B and the balance of Fe and other impurity elements. The novel product is invented for comprehensively considering the mixing of the pipe wall and soil and stone and ensuring the safety coefficient of the radial rigidity of the cast pipe and the fluid pressure and flow speed, and the product is good in application prospect, can be used for gravity flow drainage, water drainage and pollution discharge under pressure, is particularly suitable for a water conveying pipe network, and has good applicability and social benefits.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron pipe processing, and in particular to a ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8. Background Art

[0002] Ductile iron pipe is a major type of cast iron alloy pipe. It has the physical and chemical properties of conventional cast iron alloys and is a cast iron alloy pipe with mechanical properties similar to those of steel cast pipes. Under an optical microscope, the conventional metallographic structure of ductile iron pipes after annealing heat treatment is: a large amount of ferrite structure (F), graphite structure (G) and a small amount of pearlite structure (P). It has good mechanical and mechanical properties, excellent corrosion resistance, excellent ductility, excellent sealing effect, and simple installation. It is widely used in the supply and transportation of conventional gases and liquids in the manufacturing industry.

[0003] At present, due to the requirements of saving costs, reducing energy loss, reducing carbon emissions and so on, it is a general trend to reduce the thickness of cast pipe walls; the transported fluid not only needs to consider the physical and chemical properties of the internal transported fluid but also the comprehensive effects of the external environment. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] The purpose of the present invention is to solve the problem of lightweight production process of cast pipes in the prior art, and to propose a ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8 grade.

[0006] 2. Technical solution

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8, comprising the following components in percentage by mass: C: 3.3wt%-3.6wt%, Si: 2.2wt%-2.8wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.05wt%-0.07wt%, Ti: ≤0.05wt%, Ni: ≤0.0 4wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, the balance is Fe and other impurity elements.

[0009] Preferably, the following components are included in mass percentage: C: 3.3wt%, Si: 2.8wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.05wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

[0010] Preferably, the following components are included in mass percentage: C: 3.6wt%, Si: 2.2wt%t%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.07wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

[0011] Preferably, the composition includes the following components in mass percentage: C: 3.4wt%, Si: 2.5wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.06wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

[0012] Preferably, the radial stiffness of the ductile iron pipe is not lower than S8 grade, and the fluid pressure of the cast pipe is not higher than PN10.

[0013] 3. Beneficial effects

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] In the present invention, the ductile iron pipe is a new product invented by comprehensively considering the mixture of the pipe wall and soil and stone and ensuring the radial stiffness of the cast pipe and the safety factor of fluid pressure and flow velocity. The product has good application prospects and can be used for gravity flow drainage, pressure drainage, and sewage discharge. It is especially suitable for water supply pipe networks and has good applicability and social benefits. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Embodiment 1:

[0018] A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8, comprising the following components in percentage by mass: C: 3.3wt%-3.6wt%, Si: 2.2wt%-2.8wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.05wt%-0.07wt%, Ti: ≤0.05wt%, Ni: ≤0.0 4wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, the balance is Fe and other impurity elements.

[0019] In this embodiment, the ductile iron pipe is a new product invented by comprehensively considering the mixture of the pipe wall and soil and stone and ensuring the radial stiffness of the cast pipe and the safety factor of fluid pressure and flow velocity. The product has good application prospects and can be used for gravity flow drainage, pressurized drainage, and sewage discharge. It is especially suitable for water supply pipelines and has good applicability and social benefits.

[0020] Embodiment 2:

[0021] It has the implementation content of the above-mentioned embodiment, wherein the specific implementation of the above-mentioned embodiment can refer to the above description, and the embodiment here will not be repeated in detail; and in the embodiment of the present application, it is different from the above-mentioned embodiment in that:

[0022] A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8, comprising the following components in mass percentage: C: 3.3wt%, Si: 2.8wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.05wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

[0023] Embodiment 3:

[0024] It has the implementation content of the above-mentioned embodiment, wherein the specific implementation of the above-mentioned embodiment can refer to the above description, and the embodiment here will not be repeated in detail; and in the embodiment of the present application, it is different from the above-mentioned embodiment in that:

[0025] A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8, comprising the following components in mass percentage: C: 3.6wt%, Si: 2.2wt%t%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.07wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

[0026] Embodiment 4:

[0027] It has the implementation content of the above-mentioned embodiment, wherein the specific implementation of the above-mentioned embodiment can refer to the above description, and the embodiment here will not be repeated in detail; and in the embodiment of the present application, it is different from the above-mentioned embodiment in that:

[0028] A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8, comprising the following components in percentage by mass: C: 3.4wt%, Si: 2.5wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.06wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance being Fe and other impurity elements.

[0029] Embodiment 5:

[0030] It has the implementation content of the above-mentioned embodiment, wherein the specific implementation of the above-mentioned embodiment can refer to the above description, and the embodiment here will not be repeated in detail; and in the embodiment of the present application, it is different from the above-mentioned embodiment in that:

[0031] A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8. The radial stiffness of the ductile iron pipe is not lower than the S8 grade, and the fluid pressure of the cast pipe is not higher than PN10.

[0032] In this embodiment, the water delivery pressure PN10 and the ring stiffness S8 level generally refer to the design and performance standards of the pipeline system. These standards are used to ensure that the pipeline system can safely and effectively transmit fluids while meeting specific pressure and stiffness requirements.

[0033] In this embodiment, the water delivery pressure PN10: This indicator refers to the maximum working pressure that the pipeline system can withstand under the design conditions, and the unit is Newton per square centimeter (N / cm 2 ) ; PN10 means that the maximum working pressure of the pipeline system is designed to be 10 bar (1MPa), which is a relatively low pressure level and is suitable for some application scenarios with low pressure requirements.

[0034] In this embodiment, ring stiffness S8: Ring stiffness is an indicator to measure the ability of the pipeline to resist external pressure and load; S8 means that the pipeline has reached the standard of 8kN / m in the ring stiffness test, which is a relatively high stiffness level, which can ensure that the pipeline maintains a stable shape and is not easily deformed when subjected to external pressure or load.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ductile iron pipe product for water delivery with a water delivery pressure of PN10 and a ring stiffness of S8, characterized in that: The invention comprises the following components in mass percentage: C: 3.3wt%-3.6wt%, Si: 2.2wt%-2.8wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.05wt%-0.07wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

2. According to claim 1, a ductile iron pipe product for water supply with a water supply pressure of PN10 and a ring stiffness of S8, characterized in that: The invention comprises the following components in mass percentage: C: 3.3wt%, Si: 2.8wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.05wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

3. According to claim 1, a ductile iron pipe product for water supply with a water supply pressure of PN10 and a ring stiffness of S8, characterized in that: The invention comprises the following components in mass percentage: C: 3.6wt%, Si: 2.2wt%t%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.07wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

4. According to claim 1, a ductile iron pipe product for water supply with a water supply pressure of PN10 and a ring stiffness of S8, characterized in that: The invention comprises the following components in mass percentage: C: 3.4wt%, Si: 2.5wt%, P: ≤0.06wt%, S: ≤0.04wt%, Mn: ≤0.3wt%, Mg: 0.06wt%, Ti: ≤0.05wt%, Ni: ≤0.04wt%, Cu: ≤0.03wt%, Cr: ≤0.03wt%, V: ≤0.03wt%, Al: ≤0.03wt%, Sb: ≤0.02wt%, Sn: ≤0.02wt%, Zn: ≤0.02wt%, Pb: ≤0.01wt%, Mo: ≤0.01wt%, As: ≤0.01wt%, B: ≤0.01wt%, and the balance is Fe and other impurity elements.

5. A ductile iron pipe product for water supply with a water supply pressure of PN10 and a ring stiffness of S8 according to any one of claims 1 to 4, characterized in that: The radial rigidity of the ductile iron pipe is not lower than S8 grade, and the fluid pressure of the cast pipe is not higher than PN10.