Direct Supply from Liaocheng, Shandong | AISI 4135 Precision Steel Pipe In-Stock Inventory · Wall Thickness 1-50mm · Customization Available
I. Scientific Properties of AISI 4135 Precision Steel Pipe
AISI 4135 precision steel pipe is an alloy structural steel whose superior performance stems from a scientific chemical composition and heat treatment process. According to the Chinese National Standard GB/T 3077-2008, this material contains 0.32%–0.40% Carbon, 0.80%–1.10% Chromium, and 0.15%–0.25% Molybdenum. This composition design endows the steel with excellent comprehensive properties.
The heat treatment process employs quenching at 850°C followed by tempering at 550°C (Quenching and Tempering), resulting in a uniform tempered sorbite microstructure. This process enables the AISI 4135 precision steel pipe to achieve high strength characteristics with a Tensile Strength ≥ 985 MPa and Yield Strength ≥ 835 MPa, while maintaining an Elongation ≥ 12%.
The high-temperature performance of AISI 4135 steel pipe is particularly outstanding; it maintains high creep strength and rupture strength even at temperatures up to 500°C. Its low-temperature toughness is equally excellent, capable of withstanding cryogenic environments down to -110°C.
Special attention is required when welding AISI 4135 precision steel pipe. Due to its high carbon equivalent of 0.72%, its weldability is relatively poor. It is necessary to adopt a preheating temperature of 150–400°C and strictly controlled process measures.
AISI 4135 is not just an ordinary steel pipe; it is a crystallization of metallurgical art.
Its core lies in the precise synergy of three elements: Carbon-Chromium-Molybdenum:
- Carbon (C 0.32%–0.40%): Establishes a high-strength foundation. It allows the material to obtain a martensitic structure after quenching, pushing the Tensile Strength beyond 985 MPa.
- Chromium (Cr 0.80%–1.10%): Enhances hardenability and corrosion resistance, allowing the steel pipe to maintain structural stability even in humid environments.
- Molybdenum (Mo 0.15%–0.25%): Inhibits temper brittleness and endows the material with high-temperature stability for long-term service below 500°C. It is the core guarantee for high-pressure boilers and hydraulic systems.
After 850°C oil quenching + 550°C tempering, its Yield Strength is ≥ 835 MPa, Elongation ≥ 12%, and Impact Energy ≥ 63 J (reliable even at -110°C), far exceeding ordinary carbon steel.This is not just a material; it is the industrial backbone that withstands heavy loads, shocks, and thermal cycles.
II. In-Stock Specifications: Industrial Standards Precise to the Micron
Liaocheng manufacturers maintain in-stock inventory covering outer diameters from Φ6mm to Φ133mm, with wall thicknesses ranging from 1mm to 50mm. We support multiple standards including Chinese Standard GB/T 3077-2015, German Standard 1.7220, and American Standard AISI 4135.
Liaocheng manufacturers provide a complete range of AISI 4135 precision steel pipe specifications to meet diverse needs. Regular stock covers outer diameters from 8-230mm and wall thicknesses from 1-30mm. Some manufacturers, such as Shan Ddong Yuan Sheng Steel Pipe Manufacturing Co., Ltd., can produce precision bright steel pipes with outer diameters of 14-159mm and wall thicknesses of 1-30mm.
Regarding special specifications, manufacturers can customize thick-walled pipes with wall thicknesses up to 50mm, as well as small-caliber thin-walled pipes. Product precision control is strict, with inner and outer diameter tolerances achievable to ±0.05mm, and a smooth surface free of oxidation layers.
Liaocheng manufacturers have a complete range of AISI 4135 precision steel pipes. Below is a list of typical specifications:
| Outer Diameter (mm) | Wall Thickness (mm) | Common Spec Combinations | Dimension Tolerance | Surface Roughness (Ra) |
| 10 | 1.0–2.0 | 10×1.5, 10×2 | ±0.03mm | ≤0.8μm |
| 18 | 2.0–3.5 | 18×2.5, 18×3 | ±0.04mm | ≤0.6μm |
| 25 | 2.5–5.0 | 25×2.5, 25×4 | ±0.05mm | ≤0.4μm |
| 38 | 3.0–6.0 | 38×3, 38×5 | ±0.05mm | ≤0.4μm |
| 51 | 4.0–8.0 | 51×5, 51×6 | ±0.06mm | ≤0.6μm |
| 76 | 5.0–12.0 | 76×6, 76×10 | ±0.08mm | ≤0.8μm |
| 108 | 6.0–18.0 | 108×8, 108×12 | ±0.10mm | ≤1.0μm |
| 133 | 8.0–20.0 | 133×10, 133×15 | ±0.12mm | ≤1.2μm |
All specifications support cold drawing and precision drawing. The inner wall is free of oxidation layers, outer diameter ovality is ≤ 0.3mm, and straightness is ≤ 0.5mm/m. We offer ready-to-use delivery, saving you machining costs.
III. Shandong Liaocheng Manufacturer Prices & Stock Advantages
Transparent Pricing: Factory direct supply with no middleman markups.As a national hub for the steel pipe industry, Shandong Liaocheng possesses a complete industrial chain and logistics advantages. Local manufacturers, such as Liaocheng Hongjin Pipe Industry Co., Ltd., offer competitive prices starting from 4320 RMB/ton, with a minimum order quantity of only 0.1 tons, supporting small-batch procurement.
Price ranges vary according to the manufacturing process: Ordinary hot-rolled pipes range from 3400-4500 RMB/ton, while precision cold-drawn pipes range from 4500-5900 RMB/ton. This price difference stems from the more complex production process and higher dimensional accuracy of cold-drawn pipes.
A common advantage of Liaocheng manufacturers is large in-stock inventories. For example, Shan Dong Yuan Sheng Steel Pipe Manufacturing Co., Ltd. keeps over 2000 tons of stock on hand, covering more than 700 specifications. Many manufacturers support on-demand customization with short lead times; for instance, Hongjin Pipe Industry promises shipment within 2 days after payment.
2026 Liaocheng Spot Market Price (Tax included, 1 ton minimum):
| Wall Thickness Range | Market Reference Price (RMB/ton) | Description |
| 1–3mm | 5,800 – 6,500 | High-precision cold drawn, Surface Ra ≤ 0.4μm |
| 3–8mm | 5,200 – 6,000 | Standard cold drawn, Mainstream industrial usage |
| 8–20mm | 4,800 – 5,500 | Hot rolled + Cold drawn composite process |
| 20–50mm | 4,100 – 4,700 | Large caliber thick wall, Custom production required |
Small Batch Support: Orders start from 1 piece; dropshipping available.Custom Rush Orders: Delivery within 72 hours. Supports deep processing such as cutting, drilling, and end-face grinding.
IV. Application Scenarios: The Hardcore Backbone from Hydraulic Cylinders to Wind Turbine Main Shafts
- Hydraulic Systems: Cylinder tube inner wall Ra ≤ 0.4μm, pressure resistance up to 35MPa, no leakage, service life increased by 3 times.
- Automobile Crankshafts: Excellent fatigue strength, no cracks after 10⁶ cycles of alternating load testing.
- Wind Turbine Main Shafts: Low-temperature impact toughness ≥ 50J at -40°C, suitable for extremely cold environments.
- Oil Drill Pipes: High temperature resistance and hydrogen embrittlement resistance, suitable for deep well conditions at 500°C.
- High-Pressure Boiler Pipes: Long-term service at 500°C, creep rate < 0.01%/1000h.
V. Customization Services: Liaocheng Smart Manufacturing, Flexible Response
- ✅ Small Batch Customization: Orders start from 1 piece. Supports non-standard sizes and special heat treatment.
- ✅ Surface Treatment: Bright annealing, pickling and passivation, nickel plating for rust prevention.
- ✅ Inspection Guarantee: Ultrasonic + Eddy Current double flaw detection, crack detection rate of 0.02mm.
- ✅ Traceability System: Each batch of steel pipes is accompanied by a material certificate, heat treatment records, and flaw detection report.
- ✅ Logistics Response: Direct shipping from local Liaocheng warehouses. Next-day delivery in Shandong and North China.
AISI 4135 Precision Steel Pipe Manufacturer Strength Guarantee:
- Production Strength: Introduction of internationally advanced cold drawing and rolling production lines, equipped with spectrometers and non-destructive testing equipment to ensure zero defects.
- Certifications: ISO9001 certified, Special Equipment Manufacturing License holder. Products comply with GB/T 3639 standards.
- Service Commitment: Material certificates and inspection reports provided; supports deep processing services like cutting, chamfering, and threading; nationwide delivery with compensation for damages.
Choosing direct supply AISI 4135 precision steel pipe from Liaocheng means choosing:
- Quality: Precise composition + rigorous craftsmanship, performance exceeds national standards.
- Cost: Factory direct pricing, saving 20% on procurement costs.
- Efficiency: In-stock availability + fast customization, shortening project cycles.
AISI 4135 precision steel pipe is widely used in the machine tool manufacturing field. A large machinery manufacturing enterprise purchased products from Liaocheng manufacturers for hydraulic cylinder manufacturing. Thanks to the high precision and uniform wall thickness distribution of the steel pipes, the product qualification rate increased by approximately 30%.
With the application of new materials and processes, AISI 4135 precision steel pipe has begun to enter the new energy and aerospace fields. In the future, with the technological upgrading of Liaocheng manufacturers, this traditional material will show broader application prospects.
Precise parameters are the cornerstone of reliability. When selecting AISI 4135 precision steel pipe, please confirm your usage environment, pressure load, and precision requirements. Liaocheng manufacturers will match you with the most suitable specifications and models.
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