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Help CenterSteel Pipe & Tube & Petroleum Cracking Pipe，20#、15CrMoG、12Cr1MoVG、Cr5Mo
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I. Product Overview
Petroleum cracking pipes are core seamless steel pipes specially used in cracking reaction units during petroleum refining. They are mainly made of high-quality carbon structural steel and alloy structural steel through multiple refined processes such as precision smelting, hot working, cold drawing/cold rolling, heat treatment and non-destructive testing. Its core characteristics are high temperature resistance, high pressure resistance, corrosion resistance and impact resistance, with smooth and impurity-free inner walls, uniform wall thickness, high dimensional accuracy, and no defects such as sand holes, cracks and oxide scales. It can operate stably for a long time under working conditions of high temperature (200-600℃), high pressure (10-50MPa) and corrosive media such as sulfur and hydrogen. Compared with ordinary seamless steel pipes, petroleum cracking pipes have strict requirements on material purity, mechanical properties and corrosion resistance. They are indispensable key pressure-bearing pipeline materials in petroleum refining and chemical production, and are widely used in core units such as catalytic cracking, hydrocracking and delayed coking.
II. Core Production Process
Raw material inspection (chemical composition and mechanical property testing) → billet smelting → hot piercing billet making → cold drawing/cold rolling precision processing → normalizing/annealing/quenching and tempering heat treatment → precision derusting and passivation treatment of inner and outer walls → fixed-length cutting → non-destructive testing (eddy current, ultrasonic, hydrostatic test) → dimensional accuracy verification → surface anti-corrosion treatment → packaging and warehousing. Refined control is implemented throughout the whole process, focusing on controlling billet purity, heat treatment process and wall thickness deviation to ensure the high temperature resistance, high pressure resistance and dimensional consistency of the pipeline, so as to meet the harsh requirements of petroleum cracking working conditions.
III. Material Grades, Corresponding Standards and Common Specifications
The material and specification of this product can be customized according to the customer's actual working conditions (temperature, pressure, medium). The following are conventional and common specifications, covering the mainstream procurement needs of the petroleum refining industry. The dimensional tolerance strictly follows the relevant standards and is suitable for the installation and use of various cracking units.
(I) Common Materials and Corresponding Standards
Material Grade |
Implementation Standard (National/International Standard) |
Applicable Working Conditions |
Core Characteristics |
20# |
National Standard GB/T 9948-2013; Equivalent to ASTM A106; DIN 2448 |
Medium-low temperature, medium-low pressure cracking pipelines, no strong corrosive medium |
Good plasticity, easy to process, temperature resistance ≤450℃, high pressure resistance ≤20MPa |
15CrMoG |
National Standard GB/T 9948-2013; Equivalent to ASTM A335 P11; DIN 15CrMo |
Medium-high temperature, medium-high pressure cracking units, with slightly corrosive medium |
High temperature resistance, creep resistance, temperature resistance ≤550℃, high pressure resistance ≤30MPa, corrosion resistance |
12Cr1MoVG |
National Standard GB/T 9948-2013; Equivalent to ASTM A335 P22; DIN 12Cr1MoV |
High temperature, high pressure cracking reaction pipelines, sulfur-containing medium |
Excellent high temperature resistance, temperature resistance ≤580℃, high pressure resistance ≤40MPa, sulfur corrosion resistance |
Cr5Mo |
National Standard GB/T 9948-2013; Equivalent to ASTM A335 P5; DIN Cr5Mo |
High temperature, strong corrosion cracking pipelines, hydrogen-containing and sulfur-containing media |
Strong corrosion resistance, temperature resistance ≤600℃, high pressure resistance ≤50MPa, hydrogen embrittlement resistance |
(II) Common Specification Parameters
Material |
Common Outer Diameter (mm) |
Common Wall Thickness (mm) |
Regular Length (m) |
Applicable Scenarios |
20# |
159, 219, 273, 325, 377, 426 |
6.0, 8.0, 10.0, 12.0, 14.0 |
6 (Customizable 2-12) |
Low-temperature feed pipes and return pipes of cracking units |
15CrMoG |
108, 159, 219, 273, 325 |
8.0, 10.0, 12.0, 14.0, 16.0 |
6 (Customizable 2-12) |
Medium-temperature and medium-pressure pipelines of catalytic cracking units |
12Cr1MoVG |
89, 108, 159, 219, 273 |
10.0, 12.0, 14.0, 16.0, 18.0 |
6 (Customizable 2-12) |
High-temperature and high-pressure reaction pipes of hydrocracking units |
Cr5Mo |
76, 89, 108, 159, 219 |
10.0, 12.0, 14.0, 16.0, 20.0 |
6 (Customizable 2-12) |
High-temperature and strong corrosion pipelines of delayed coking units |
Supplementary Note: Non-standard specifications can be customized according to customer's actual needs. The outer diameter can be extended to 32mm—530mm, the wall thickness can be extended to 3.0mm—30mm, the length can be customized to any size from 2m to 12m, and the dimensional tolerance can be adjusted to ±0.03mm (ultra-high precision), which is suitable for the installation needs of special working conditions.
IV. Implementation Standards
National Standards: GB/T 9948-2013 "Seamless Steel Pipes for Petroleum Cracking", GB/T 8163-2018 "Seamless Steel Pipes for Fluid Transportation", GB/T 3087-2018 "Seamless Steel Pipes for Low and Medium Pressure Boilers"; International General Standards: ASTM A106 (American Standard), ASTM A335 (American Standard for High Temperature Alloy Steel Pipes), DIN 2448 (German Standard), JIS G3459 (Japanese Standard), etc. Customized production according to national standards of various countries is supported, which fully meets the acceptance requirements of the petrochemical industry and the customs clearance requirements for foreign trade export.
V. Specification Parameters (General Supplement)
Dimensional Tolerance: Regular high precision ±0.05mm—0.10mm, ultra-high precision can be customized to ±0.03mm, roundness ≤0.02mm/m, straightness ≤0.2mm/m, wall thickness uniformity ≤0.1mm
Surface Condition: Pickled and passivated surface (no oxide scale, no burrs, no rust), cold-drawn bright surface (Ra≤0.8μm), smooth inner wall without impurities, small medium flow resistance, which can effectively prevent coking and blockage
Delivery Condition: According to the material and working condition requirements, various delivery conditions such as normalizing, annealing and quenching and tempering (HRC 28-32) are provided. The heat treatment process can be customized to ensure that the high temperature resistance and creep resistance of the pipeline meet the standards
End Treatment: Plain end (no burrs), beveled end (30°/37.5°, suitable for welding), threaded end (BSP/NPT standard, with protective cap), and the treatment method can be customized according to installation needs
VI. Chemical Composition (Regular Materials, Unit: %)
Material |
C |
Si |
Mn |
P |
S |
Other Alloy Elements |
20# |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
≤0.035 |
≤0.035 |
None |
15CrMoG |
0.12-0.18 |
0.17-0.37 |
0.40-0.70 |
≤0.035 |
≤0.035 |
Cr:0.80-1.10; Mo:0.40-0.55 |
12Cr1MoVG |
0.08-0.15 |
0.17-0.37 |
0.40-0.70 |
≤0.035 |
≤0.035 |
Cr:1.00-1.50; Mo:0.25-0.35; V:0.15-0.30 |
Cr5Mo |
0.15-0.25 |
0.50-1.00 |
0.30-0.60 |
≤0.035 |
≤0.035 |
Cr:4.00-6.00; Mo:0.45-0.65 |
VII. Mechanical Properties
Material |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HB) |
High Temperature Resistance Limit (℃) |
20# (Normalized State) |
≥410 |
≥245 |
≥25 |
130-150 |
450 |
15CrMoG (Quenched and Tempered State) |
≥450 |
≥295 |
≥22 |
140-170 |
550 |
12Cr1MoVG (Quenched and Tempered State) |
≥490 |
≥315 |
≥20 |
150-180 |
580 |
Cr5Mo (Annealed State) |
≥440 |
≥295 |
≥20 |
140-170 |
600 |
Supplementary Note: Mechanical properties can be adjusted according to heat treatment processes to meet the strength and toughness requirements of different temperature and pressure working conditions. The product has excellent high pressure resistance. Conventional materials can withstand 10-30MPa pressure, and special materials (Cr5Mo) can be customized to withstand more than 50MPa pressure. It has qualified hydrogen embrittlement resistance and sulfur corrosion resistance, and is suitable for long-term operation under harsh working conditions.
VIII. Core Product Advantages
High Temperature and High Pressure Resistance: Adopting high-quality alloy materials and precise heat treatment process, it can resist high temperature up to 600℃ and high pressure up to 50MPa, and can operate stably for a long time under the high temperature and high pressure working conditions of petroleum cracking, without leakage or deformation risk.
Excellent Corrosion Resistance: High material purity and reasonable alloy element ratio, with excellent sulfur resistance, hydrogen resistance and corrosion resistance, which can effectively resist the corrosive components in petroleum cracking media and extend the service life of the pipeline.
High Dimensional Accuracy: Uniform wall thickness, good roundness, high straightness, strictly controllable dimensional tolerance, smooth inner wall without impurities, reducing medium flow resistance, avoiding coking and blockage, and reducing equipment maintenance costs.
Stable and Reliable Material: Raw materials are strictly inspected, with uniform metallographic structure and precise chemical composition, no defects such as sand holes and cracks, stable mechanical properties, not easy to break or deform, and high operational safety.
Good Processability: Moderate hardness, easy for secondary processing such as welding, cutting and bending, suitable for the complex installation needs of petroleum cracking units, and can be directly installed and used without secondary treatment.
Complete Specifications and Customizable: Conventional specifications are in stock, supporting customization of non-standard sizes, special materials and special heat treatment processes to meet the personalized needs of different cracking units.
Strong Compliance: Strictly produced in accordance with relevant domestic and foreign standards, material certificates, non-destructive testing reports and third-party (SGS, CE) testing reports can be provided, which fully meets the acceptance requirements of the petrochemical industry and export customs clearance requirements.
Long Service Life: It has wear resistance, fatigue resistance and corrosion resistance, adapts to harsh working conditions, and its service life is more than 30% longer than that of ordinary seamless steel pipes, which greatly reduces equipment replacement and maintenance costs.
IX. Main Application Scope
Petroleum Refining Industry: Reaction pipes, heat exchange pipes, feed pipes, return pipes, vent pipes, etc. of catalytic cracking units, hydrocracking units, delayed coking units and atmospheric and vacuum distillation units.
Chemical Industry: High-temperature, high-pressure and corrosive medium transportation pipelines in coal chemical industry, petrochemical industry, fine chemical industry and other fields, as well as supporting pipelines for reaction units.
Energy Field: High-temperature and high-pressure pipelines in the process of oil and natural gas exploration and transportation, as well as supporting pipelines for power station boilers.
Other Fields: Pressure-bearing pipelines that need to withstand high temperature, high pressure and corrosive media in metallurgy, coking, pharmaceutical and other industries.
X. Packaging and Delivery
Packaging Method: The inner and outer walls are evenly coated with special anti-corrosion and anti-rust oil, the ports are covered with PE plastic protective caps (anti-collision and anti-rust), bundled with galvanized steel strips, and wrapped with moisture-proof wrapping film on the outside; for medium and large-diameter pipes, fumigated wooden pallets, non-fumigated pallets or wooden box packaging can be customized, which is fully suitable for long-distance transportation such as sea, land and air transportation, preventing collision and rust during transportation.
Quality Inspection Guarantee: Each batch of products is subjected to 100% hydrostatic test (test pressure ≥1.5 times the working pressure, no leakage for 30 seconds), eddy current testing, ultrasonic testing, as well as dimensional accuracy and mechanical performance sampling testing; each batch of products is accompanied by Material Test Certificate (MTC) and quality inspection report, and SGS, CE and other third-party testing reports can be provided on demand.
Delivery Cycle: Conventional specifications are in stock and can be shipped within 3-5 days.
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