{"id":6200,"date":"2025-07-09T11:20:02","date_gmt":"2025-07-09T03:20:02","guid":{"rendered":"https:\/\/alllandpipes.com\/?post_type=etheme_portfolio&p=6200"},"modified":"2025-12-17T19:10:03","modified_gmt":"2025-12-17T11:10:03","slug":"sy-t-5037","status":"publish","type":"etheme_portfolio","link":"https:\/\/alllandpipes.com\/fr\/standards\/sy-t-5037.html","title":{"rendered":"SY\/T 5037"},"content":{"rendered":"
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SY\/T 5037-2023 Technical Standard: Submerged Arc Welded Steel Pipes for General Fluid Transportation<\/b><\/strong><\/span><\/h2>

1. Standard Overview and Background<\/b><\/strong><\/span><\/h3>

SY\/T 5037<\/b><\/strong>, an industry standard developed by National Energy Administrationof China,\u2002is applicable to submerged arc welded steel pipe for general fluid transmission. The present standard new 2023 edition (SY\/T 5037-2023) was issued in October 2023 and put into practice in April\u20022024, replacing the 2018 edition. It is managet by the Petroleum Tubular Goods\u2002Standardization Committee and written by Baoji Petroleum Steel Pipe Co.,Ltd, and so on.<\/p>

Basic Description: <\/b><\/strong>This standard specifies the type of LSAW or SSAW, dimensions, materials, test requirements, test methods, and inspection countersunk socket joint,\u2002identificaion, packing etc. While meeting demands for agricultural irrigation\u2002and municipal water systems, it also provides a safe and reliable solution for water, air, steam and other non-corrosive fluids.<\/p>

2. Champ d'application<\/b><\/strong><\/span><\/h3>

2.1 Applications primaires<\/b><\/strong><\/span><\/h4>

Fluid Types<\/b><\/strong>: Water, air, heating steam, and non-corrosive fluids;<\/p>

Engineering Scenarios<\/b><\/strong>:<\/p>

Municipal water supply\/drainage, long-distance water transfer (e.g., South-North Water Diversion Project)<\/p>

Agricultural irrigation, coal\/mineral slurry pipelines<\/p>

Low-pressure gas distribution and industrial cooling systems;<\/p>

Structural Use<\/b><\/strong>: Supports\u00a0socket-spigot flexible joints<\/b><\/strong>\u00a0with rubber seals for rapid assembly and seismic adaptability.<\/p>

2.2 Key Performance Adaptations<\/b><\/strong><\/span><\/h4>

Pressure Range<\/b><\/strong>: Design pressure \u22644.0 MPa (medium-low pressure systems);<\/p>

Environmental Suitability<\/b><\/strong>:<\/p>

Ambient to medium temperatures (\u2264120\u00b0C);<\/p>

Requires external coatings (e.g., coal-tar epoxy) for buried corrosion resistance.<\/p>

3. Dimensions et tol\u00e9rances<\/b><\/strong><\/span><\/h3>

3.1 Plages de taille<\/b><\/strong><\/span><\/h4>

Diam\u00e8tre ext\u00e9rieur (OD)<\/b><\/strong>: 273\u20132540 mm (large diameters >1422 mm for main water lines);<\/p>

\u00c9paisseur de la paroi (WT)<\/b><\/strong>: 5\u201325 mm (enhanced design up to 60 mm for X70 grade);<\/p>

Length (L)<\/b><\/strong>: 6\u201312 m (\u00b1500 mm tolerance; precise lengths require agreement).<\/p>

3.2 Tolerance Requirements<\/b><\/strong><\/span><\/h4>

*Table 1: Key Tolerances (SY\/T 5037-2023)*<\/p>

Param\u00e8tres<\/b><\/strong><\/td>Gamme de tailles<\/b><\/strong><\/td>\u00c9cart admissible<\/b><\/strong><\/td><\/tr>
Pipe Body OD<\/b><\/strong><\/td><508 mm<\/td>\u00b10.75% OD (Max \u00b12.5 mm)<\/td><\/tr>
\u2265508 mm<\/td>\u00b11.00% OD (Max \u00b14.5 mm)<\/td><\/tr>
Pipe End OD<\/b><\/strong><\/td>100 mm from end<\/td>Max OD \u22641.01D, Min OD \u22650.99D<\/td><\/tr>
\u00c9paisseur de la paroi<\/b><\/strong><\/td><508 mm<\/td>\u00b112.5% WT<\/td><\/tr>
\u2265508 mm<\/td>\u00b110.0% WT<\/td><\/tr>
End Squareness<\/b><\/strong><\/td><813 mm<\/td>\u22641.6 mm<\/td><\/tr>
\u2265813 mm<\/td>\u22643.0 mm<\/td><\/tr><\/tbody><\/table><\/figure>

Geometric Tolerances<\/b><\/strong>:<\/p>

Ovalie<\/b><\/strong>: OD variation \u22641% at pipe ends (100 mm range);<\/p>

Rectitude<\/b><\/strong>: Overall bow \u22640.2% L; local deviation (1 m) \u22642 mm;<\/p>

End Bevel<\/b><\/strong>: Angle 30\u00b0\u00b15\u00b0, root face 1.6\u00b10.8 mm.<\/p>

4.\u00a0<\/b>Testing and Inspection<\/b><\/strong><\/span><\/h3>

4.1 Mandatory Tests<\/b><\/strong><\/span><\/h4>

Test hydrostatique<\/b><\/strong>:<\/p>

Pressure Formula<\/b><\/strong>:\u00a0P = 2St\/D<\/b><\/strong>\u00a0(S = 60% yield strength; min. 1.0 MPa);<\/p>

La dur\u00e9e<\/b><\/strong>: \u22655 s (\u226510 s for OD >813 mm);<\/p>

Alternative<\/b><\/strong>: UT + RT for DN<600 mm pipes.<\/p>

Non-Destructive Examination (NDE)<\/b><\/strong>:<\/p>

Inspection des soudures<\/b><\/strong>: 100% UT + RT; RT acceptance per GB\/T 3323 Level II;<\/p>

Defect Sensitivity<\/b><\/strong>: UT detects \u226550\u00d71\u00d712.5% WT reference notches.<\/p>

4.2 Material Performance Tests<\/b><\/strong><\/span><\/h4>

Essais m\u00e9caniques<\/b><\/strong>:<\/p>

Tensile Test<\/b><\/strong>: 2 samples\/batch (\u2264100 pipes); measures yield (R\u2091L), tensile strength (R\u2098), elongation;<\/p>

Charpy Impact<\/b><\/strong>: Optional per agreement; \u226540 J avg. at 0\u00b0C for Q355B;<\/p>

Guided Bend Test<\/b><\/strong>: Evaluates weld toughness; mandrel \u22644\u00d7WT (2023 adds reverse bend).<\/p>

5. Chemical Composition and Mechanical Properties<\/b><\/strong><\/span><\/h3>

5.1 Grades and Chemistry<\/b><\/strong><\/span><\/h4>

Covers\u00a0carbon and low-alloy steels<\/b><\/strong>:<\/p>

Q235B<\/b><\/strong>\u00a0(Carbon steel): Low-pressure water pipes;<\/p>

Q355B<\/b><\/strong>\u00a0(Low-alloy steel): High-strength applications;<\/p>

20# Steel<\/b><\/strong>\u00a0(New in 2023): Improved weldability\/toughness.<\/p>

Table 2: Chemical Requirements (wt%, PSL 1)<\/p>

\u00c9l\u00e9ment<\/b><\/strong><\/td>Q235B<\/b><\/strong><\/td>Q355B<\/b><\/strong><\/td>20# Steel<\/b><\/strong><\/td><\/tr>
C \u2264<\/td>0.20<\/td>0.20<\/td>0.20<\/td><\/tr>
S \u2264<\/td>0.035<\/td>0.035<\/td>0.030<\/td><\/tr>
P \u2264<\/td>0.035<\/td>0.035<\/td>0.030<\/td><\/tr>
Mn \u2264<\/td>1.40<\/td>1.60<\/td>0.70<\/td><\/tr><\/tbody><\/table><\/figure>

Impurity Control<\/b><\/strong>: Strict S\/P limits mitigate hot\/cold brittleness.<\/p>

5.2 Mechanical Properties<\/b><\/strong><\/span><\/h4>

Table 3: Mechanical Requirements<\/p>

Grade<\/b><\/strong><\/td>Limite d'\u00e9lasticit\u00e9 (MPa)<\/b><\/strong><\/td>R\u00e9sistance \u00e0 la traction (MPa)<\/b><\/strong><\/td>\u00c9longation (%)<\/b><\/strong><\/td><\/tr>
Q235B<\/b><\/strong><\/td>\u2265235<\/td>370\u2013500<\/td>\u226525<\/td><\/tr>
Q355B<\/b><\/strong><\/td>\u2265355<\/td>470\u2013630<\/td>\u226522<\/td><\/tr>
20# Steel<\/b><\/strong><\/td>\u2265245<\/td>\u2265410<\/td>\u226524<\/td><\/tr><\/tbody><\/table><\/figure>

Rapport rendement\/traction<\/b><\/strong>: \u22640.93 (prevents overload fracture);<\/p>

R\u00e9sistance de la soudure<\/b><\/strong>: \u226595% of base metal.<\/p>

6. Key Updates in 2023 Edition<\/b><\/strong><\/span><\/h3>

Major revisions vs. 2018:<\/p>

Dimensions & Tolerances<\/b><\/strong>:<\/p>

Extended OD to 2540 mm; refined tolerances for >1422 mm pipes;<\/p>

Standardized circumference calculation (\u03c0=3.14).<\/p>

Material & Testing<\/b><\/strong>:<\/p>

Added\u00a020# steel grade<\/b><\/strong>;<\/p>

Enhanced\u00a0Charpy impact<\/b><\/strong>\u00a0criteria with low-temp toughness;<\/p>

Introduced\u00a0reverse-bend test<\/b><\/strong>\u00a0for weld assessment.<\/p>

Defect Control<\/b><\/strong>:<\/p>

Repair limits: Single repair \u2264150 mm; total \u2264300 mm\/pipe;<\/p>

Reduced misalignment: \u22640.15t for WT\u226412.5 mm (was 0.2t).<\/p>

7. Engineering Applications & Future Trends<\/b><\/strong><\/span><\/h3>

SY\/T 5037-2023 ensures safety through\u00a0full-process quality control<\/b><\/strong>:<\/p>

Manufacturing Protocols<\/b><\/strong>:<\/p>

SSAW pipes use\u00a0double-sided SAW<\/b><\/strong>; strip joints \u2265300 mm from pipe ends;<\/p>

Socket joints:\u00a0Integral forming<\/b><\/strong>\u00a0(expansion\/rolling) or\u00a0welded<\/b><\/strong>.<\/p>

Defect Management<\/b><\/strong>:<\/p>

Scratches: Grind if depth <3 mm; weld repair if deeper;<\/p>

Laminations: Cut out if >6.4 mm.<\/p>

Future Developments<\/b><\/strong>:<\/p>

Durabilit\u00e9<\/b><\/strong>: Low-carbon steelmaking (e.g., hydrogen metallurgy) for hydrogen transport;<\/p>

Digitalization<\/b><\/strong>: Automated UT (ISO 10893-11) and digital RT (GB\/T 40385);<\/p>

Standard Integration<\/b><\/strong>: Alignment with GB\/T 9711 (oil\/gas pipes) and GB\/T 13295 (ductile iron pipes).<\/p>

Conclusion: Balancing Safety and Efficiency<\/b><\/strong><\/span><\/h4>

SY\/T 5037-2023 provides a\u00a0robust technical framework<\/b><\/strong>\u00a0for general fluid pipelines via precise tolerances, material grading, and rigorous testing. Continuous updates (e.g., 20# steel, joint optimization) reflect responsiveness to engineering demands. As materials and NDE technologies evolve, this standard will further harmonize safety and resource efficiency.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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