I. Product Name:

Technical consultation for dedicated new energy transmission pipelines (long-distance hydrogen pipelines/supercritical CO₂ transmission pipelines).

II. Scope of Supply:

Our services cover material selection, hydrogen embrittlement protection solutions, CO₂ corrosion control strategies, welding process optimization, and interpretation of industry standards for dedicated pipelines in the clean energy sector. Consulting services include: optimization of steel gradation for hydrogen pipelines (prioritizing low-strength steels such as L245–L360), design of hydrogen-sensitive welding parameters, hydrogen leak detection solutions, requirements for pipeline materials in supercritical CO₂ phase management, and safety assessment of pipelines for carbon capture engineering projects.

III. Main Products/Material Brand Range:

Product types: Hydrogen transportation pipelines (pure hydrogen/hydrogen-blended natural gas pipelines), supercritical CO₂ transportation pipelines.

Material steel grade: L245, L290, L360 (low-strength steel preferred, with low sensitivity to hydrogen embrittlement).

Implementation standards: ASME B31.12 (Hydrogen Pipeline Design), GB 50251 (Gas Pipeline Engineering Design), Technical Specification for Design of Pipes for Long-Distance Hydrogen Pipelines (Participating Unit).

Welding process: Low-hydrogen welding material + post-weld hydrogen removal heat treatment, strictly control the diffusible hydrogen content of the weld to ≤2mL/100g.

Brand: Hebei Haiqianwei Steel Pipe Co., Ltd. (HSPC), a participating unit in the compilation of the "Technical Specification for Design of Pipes for Long-Distance Hydrogen Pipelines".

IV. Supply Cooperation Forms:

We support customized R&D and production of hydrogen/CO₂ pipelines, and can design material ratios according to customer-specified operating conditions (pressure/temperature/medium concentration).

We provide hydrogen resistance performance test reports: SSC (sulfide stress cracking resistance), HIC (hydrogen-induced cracking resistance), and detection of diffuse hydrogen content in the base material and weld.

We can undertake the full supply of new energy demonstration projects (for example, the Perdaman Ceres global large-scale urea base hydrogen service project in Australia, where the company handled the entire hydrogen pipeline supply).

We support endorsement from participating organizations in the drafting of technical specifications and can provide consultation on industry standard interpretation.

V. Online Consultation Channels:

Official website: www.haiqianwei.com / www.hspc.cc

Email: [email protected]

Contact Person: Manager Liu 13111777118

Landline: 0317-6091369 / 0317-6091368

Online paid consultation platform ($9.9 USD/session).

VI. Detailed Product Specifications:

Parameter 1 (resistance to hydrogen embrittlement): The diffusible hydrogen content in the base material and weld is ≤2mL/100g, and the hardness is controlled at HV10 ≤250, which meets the requirements of NACE TM0177 resistance to hydrogen-induced cracking test and effectively inhibits the decrease in ductility and delayed fracture caused by hydrogen atoms penetrating into the crystal lattice under high-pressure hydrogen environment.

Parameter 2 (Applicable pressure rating): Design pressure of hydrogen pipeline PN2.5–PN10 (2.5–10MPa), design pressure of CO₂ pipeline PN8–PN15 (supercritical phase, 8–15MPa), which can cover all pressure scenarios from urban hydrogen pipeline network to long-distance hydrogen/CO₂ transmission trunk line.

Parameter 3 (CO₂ corrosion resistance): Under a water-containing CO₂ environment (simulating oil and gas field produced water + CO₂ partial pressure 0.1–1.0 MPa), the annual corrosion rate is ≤0.1 mm/a, which is much lower than the typical corrosion rate of carbon steel of 1–5 mm/a under the same conditions, and the design life is ≥30 years.

VII. Parameter Correspondence and Function Description:

Hydrogen embrittlement resistance (diffuse hydrogen ≤ 2 mL/100g, hardness HV10 ≤ 250): Hydrogen embrittlement is the most fatal failure mode for hydrogen pipelines—hydrogen atoms in high-pressure hydrogen gas penetrate into the interstitial spaces of the steel lattice, accumulating at defects such as dislocations and inclusions to form hydrogen molecules, generating internal high pressure that leads to the initiation and propagation of microcracks, ultimately causing sudden brittle fracture of the pipeline. By selecting low-strength steel (L245–L360, yield strength ≤ 360 MPa), controlling the diffusible hydrogen content in the weld (low-hydrogen welding materials + post-weld hydrogen removal treatment), and limiting the material hardness (HV10 ≤ 250), hydrogen embrittlement sensitivity can be significantly reduced. Diffusible hydrogen ≤ 2 mL/100g is an industry-recognized "safe threshold," at which level the effect of hydrogen atoms on the toughness of the steel is negligible.

Applicable pressure ratings (PN2.5–PN15): Pressure classification design for long-distance hydrogen pipelines—low operating pressure (PN2.5–PN4) for urban gas pipelines blended with hydrogen (<10% by volume), and medium to high operating pressure (PN6.3–PN10) for pure hydrogen long-distance trunk lines; supercritical CO₂ transportation requires pressures higher than the CO₂ critical pressure (7.38 MPa) to maintain single-phase dense-phase transportation, reducing pressure fluctuations and accelerated corrosion caused by phase changes. PN8–PN15 covers the entire pressure scenario of CCUS (Carbon Capture, Utilization and Storage), enabling the product to be adapted to both hydrogen energy and carbon emission reduction, two major new energy infrastructure fields.

CO₂ corrosion rate resistance (≤0.1 mm/a): CO₂ dissolves in water to form carbonic acid, which can corrode carbon steel at rates of 1–5 mm/a (and even above 10 mm/a in severe cases). This is a major cause of failure in oil and gas field produced water pipelines and CO₂ transport pipelines. By optimizing the steel composition (reducing carbon equivalent and adding corrosion-resistant elements such as Cr/Mo), controlling the morphology of non-metallic inclusions, and using a matching internal anti-corrosion coating, the corrosion rate can be controlled at ≤0.1 mm/a (i.e., "slight corrosion" level). During the 30-year design life, the pipe wall thinning will not exceed 3 mm, far below the corrosion allowance allowed by the specifications (usually 3–6 mm), ensuring the safe operation of the pipeline within its design life.