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Established in 2003, Shaanxi Kerlimar Engineers Co., Ltd. has developed a global reputation as a premier supplier of high-grade piping solutions, specialized raw materials, and precision-manufactured process components. For over 21 years, our engineers have supported large-scale mechanical, energy, structural, and infrastructure developments around the world.
We supply a diverse material spectrum—covering carbon steel, alloy steel, and premium austenitic/duplex stainless steels. Our manufacturing portfolio features high-tolerance seamless pipes, straight-seam welded pipes (ERW/LSAW), spiral welded pipes (SSAW), and high-performance butt-weld piping fittings.
Every product we supply is certified to rigorous international specifications including ASTM, ASME, EN, DIN, and JIS, assuring seamless implementation across highly demanding industrial environments.
A 3/4 inch nominal bore (NPS 3/4 / DN20) stainless steel pipe is a fundamental element in high-pressure fluid loops, instrumentation systems, processing lines, and structural framing. Proper material selection requires deep knowledge of wall thicknesses, schedules, and specific steel grade properties.
| NPS (Inches) | Outside Diameter (OD) | Schedule | Wall Thickness (in/mm) | Inside Diameter (ID) | Nominal Weight (lb/ft / kg/m) |
|---|---|---|---|---|---|
| 3/4" (DN20) | 1.050" (26.7 mm) | Sch 10S | 0.083" (2.11 mm) | 0.884" (22.48 mm) | 0.86 lb/ft (1.28 kg/m) |
| 3/4" (DN20) | 1.050" (26.7 mm) | Sch 40S | 0.113" (2.87 mm) | 0.824" (20.96 mm) | 1.13 lb/ft (1.68 kg/m) |
| 3/4" (DN20) | 1.050" (26.7 mm) | Sch 80S | 0.154" (3.91 mm) | 0.742" (18.88 mm) | 1.48 lb/ft (2.20 kg/m) |
| 3/4" (DN20) | 1.050" (26.7 mm) | Sch 160 | 0.219" (5.56 mm) | 0.612" (15.54 mm) | 1.94 lb/ft (2.89 kg/m) |
Grade 304 contains 18% chromium and 8% nickel, perfect for structural integrity and mild corrosion environments. Grade 316 introduces 2% molybdenum, preventing pitting and crevice corrosion under exposure to chlorides, acids, and marine settings.
L-grades restrict carbon to below 0.03%, eliminating carbide precipitation during welding. This mitigates intergranular corrosion risk in weld heat-affected zones without compromising yield strength.
Our standard finishes range from Pickled & Annealed (mill finish) to Bright Annealed (BA) and 180-600 grit mechanical polish, matching sanitization levels required for food-grade, cosmetics, and cleanroom loops.
The Chinese steel industry has evolved into a global leader in high-end metallurgy, combining smart production automation with extensive quality assurance procedures. At Shaanxi Kerlimar Engineers Co., Ltd., we leverage these advancements to guarantee structural integrity, material traceability, and prompt logistical handling.
Led by Chairman Mr. Ming SUN, a dedicated environmentalist and pioneer in technology development, Kerlimar Engineers integrates modern manufacturing efficiency with carbon mitigation practices.
Since 2019, our research team has committed resources to new-energy systems, pioneering a proprietary vertical axis wind turbine. Incorporating maglev systems, structural cable frameworks, and modular floating land platforms, our designs have secured over 40 national and international patents.
This devotion to green manufacturing won our organization the National High-Tech Enterprise title in 2020. Our subsequent representation at the 2021 China-Finland High Technology Match Conference, the 11th China Innovation & Entrepreneurship Competition (Excellence Award), and the UN Climate Change Conference in Dubai (COP28) highlights our efforts toward clean operations. We are actively incorporating these environmental standards into our steel alloy sourcing and clean-mill operations.
High-grade 3/4" stainless steel piping systems serve critical operations across diverse industries. Below are key ways our technical configurations meet specific operational challenges:
Exposure to hydrogen sulfide (sour gas) requires 316L and duplex stainless options. Our 3/4" ASTM A312 seamless pipes resist localized stress corrosion cracking under highly acidic conditions.
For cleanroom and injection systems, we deliver internal-diameter polished tubing (ASME BPE). Electropolished finishes limit bacterial adhesion and secure sterile process transfers.
Our insulated piping systems and structural frames support high-performance solar collectors, geothermal loops, and offshore wind platforms, ensuring stable energy transmission in harsh climates.
Operating at temperatures near -196°C requires exceptional impact strength. Our austenitic grades maintain high fracture resistance, preventing sudden embrittlement.
The future of stainless steel manufacturing relies on material purity, additive integration, and sustainable manufacturing processes. By implementing digital twinning in cold-rolling and extrusion plants, we achieve high-precision dimensional stability with variations restricted to +/-0.05 mm.
To address global carbon reduction goals, we are actively adjusting our production methods:
We are shifting from coke-driven blast furnaces to Direct Reduced Iron (DRI) techniques utilizing clean hydrogen, lowering the carbon output per metric ton of stainless steel produced.
We continue to refine the nitrogen chemistry in duplex stainless steels, developing lighter pipes with high mechanical strength to reduce overall transport fuel emissions.
Every batch of our 3/4" stainless steel pipes will soon support RFID and QR tracking, linking each section directly to its raw material chemical analysis (MTR) via secure cloud storage.
Procuring industrial materials requires strict alignment with local certification and logistics protocols. Our global operations facilitate trouble-free customs clearance and direct compliance with major international engineering systems.
We provide full EN 10204 3.1 Mill Test Reports (MTR) with every shipment. Our items comply with PED 2014/68/EU (Pressure Equipment Directive) and AD2000-W0 standards for European piping projects.
We offer secure seaworthy packaging using reinforced steel-frame crates, end-cap seals, and custom rust-prevention coatings. This ensures your components arrive without surface blemishes or physical bends.
Our engineering support team is available during plant design phases to assist with thermal expansion calculations, chemical suitability reviews, and welding procedure qualification records (WPQR).
When sourcing 3/4" stainless steel pipes from Chinese manufacturing facilities, buyers should evaluate key quality parameters to ensure operational durability:
Technical and procurement answers regarding 3/4" stainless steel pipes.
The nominal size does not equal the physical outside diameter. For a standard 3/4" NPS pipe, the true outside diameter is 1.050 inches (26.7 mm). The inner diameter changes based on the wall schedule selected (e.g., Sch 10S, Sch 40S, or Sch 80S).
Seamless pipes are manufactured via extrusion, leaving no weld line. They are ideal for high-pressure processes, aggressive chemical environments, and extreme temperatures. Welded pipes (ERW) are more cost-efficient and exhibit high wall-thickness uniformity, making them suitable for structural framing, decorative fixtures, and low-pressure plumbing.
With 21 years of operational experience, we execute complete quality audits. Every delivery is supported by official Mill Test Certificates (MTRs) to EN 10204 3.1. We perform chemical verification (PMI testing), tensile testing, hydrostatic testing, and ultrasonic inspections to ensure adherence to international standards.
Standard sizes (such as NPS 3/4 Schedule 10S/40S in Grades 304/316) are typically kept in stock for swift packaging, with shipping matching port schedules in 7-14 days. Custom fabrication runs, specific finishes, or custom bevels require approximately 30-45 manufacturing days.
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