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Special Shape Steel Pipe

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CNC Machined Special Steel Tube

CNC Machined Special Steel Tube

CNC Machined Special Steel Tube is a precision-engineered steel tube processed through advanced CNC machining technology, offering excellent dimensional accuracy and customized structural solutions. It is widely used in automotive, machinery, industrial equipment, and engineering applications.

Material Type :
Carbon Steel, Alloy Steel, Stainless Steel (20#, 45#, 42CrMo, 304, 316L)
Wall Thickness Range :
1.0mm – 20mm
Length Range :
200mm – 10000mm (Customized)
Outer Size Range :
6mm – 380mm
Tolerance :
±0.02mm ~ ±0.06mm
Customizable :
Yes
Order(MOQ) :
2T

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Specifications

CNC machined special steel tubes are manufactured using advanced CNC turning, milling, drilling, and precision machining processes, ensuring tight tolerances, complex geometries, and consistent product quality. Customized profiles and machining features can be produced according to specific project requirements.

These tubes offer excellent dimensional accuracy, surface quality, and mechanical performance, making them suitable for applications requiring precise assembly and reliable operation. Carbon steel, alloy steel, and stainless steel materials can be selected based on performance requirements.

CNC machined special steel tubes are widely used in mechanical components, automation equipment, automotive systems, hydraulic assemblies, industrial machinery, and custom engineering projects, where precision machining, complex designs, and high reliability are essential.

CNC Machined Special Steel Tube is one of our core strength products. We maintain substantial inventory to ensure rapid delivery and can also customize extra-large diameter seamless pipes according to your specific requirements. Additionally, we provide comprehensive services including spectroscopic analysis, mechanical property testing, pressure testing, and non-destructive testing (NDT).

Grade	Grade Equivalent	Mechanical Properties	Size Range	Chemical Composition (Typical, %)
12L14 Free Cutting Steel	ASTM 12L14 EN 11SMnPb30 GB Y15Pb	Tensile ≥420 MPa Yield ≥190 MPa Elongation ≥22% Machinability Rating 160% Hardness 121–174 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 2–200 mm ID Range: 1–180 mm Wall Thickness: 0.5–20 mm Length: 10–6000 mm Dimensional Tolerance: ±0.005–±0.05 mm Custom CNC Machining Services Available	C≤0.15, Si≤0.10 Mn 0.85–1.15, Pb 0.15–0.35, S 0.26–0.35, P≤0.040
20# High Quality Carbon Steel	GB 20# ASTM A106 Gr.B EN C22	Tensile 415–550 MPa Yield ≥245 MPa Elongation ≥21% Hardness 156–207 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–250 mm ID Range: 2–230 mm Wall Thickness: 0.8–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.17–0.23, Si≤0.37 Mn 0.35–0.65, P≤0.035, S≤0.035
45# High Quality Carbon Steel	GB 45# ASTM 1045 EN C45	Tensile ≥600 MPa Yield ≥355 MPa Elongation ≥16% Hardness 170–229 HB (Annealed) Hardness 220–250 HB (Quenched & Tempered)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–250 mm ID Range: 2–230 mm Wall Thickness: 0.8–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.42–0.50, Si≤0.37 Mn 0.50–0.80, P≤0.035, S≤0.035
40Cr Alloy Structural Steel	GB 40Cr ASTM 5140 EN 41Cr4	Tensile ≥980 MPa Yield ≥785 MPa Elongation ≥9% Hardness 207–269 HB (Quenched & Tempered)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–250 mm ID Range: 2–230 mm Wall Thickness: 1.0–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.37–0.44, Si≤0.37 Mn 0.50–0.80, Cr 0.80–1.10, P≤0.035, S≤0.035
42CrMo High Strength Alloy Steel	GB 42CrMo ASTM 4140 EN 42CrMo4	Tensile ≥1080 MPa Yield ≥930 MPa Elongation ≥12% Hardness 217–269 HB (Quenched & Tempered)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–250 mm ID Range: 2–230 mm Wall Thickness: 1.0–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.38–0.45, Si≤0.37 Mn 0.50–0.80, Cr 0.90–1.20, Mo 0.15–0.25, P≤0.035, S≤0.035
20CrMnTi Carburizing Alloy Steel	GB 20CrMnTi ASTM 5120 EN 20MnCr5	Tensile ≥1080 MPa Yield ≥835 MPa Elongation ≥10% Hardness 217–269 HB (Annealed) Hardness 58–62 HRC (Carburized & Quenched)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–250 mm ID Range: 2–230 mm Wall Thickness: 1.0–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.17–0.23, Si≤0.37 Mn 0.80–1.10, Cr 1.00–1.30, Ti 0.04–0.10, P≤0.035, S≤0.035
GCr15 Bearing Steel	GB GCr15 ASTM 52100 EN 100Cr6	Tensile ≥610 MPa Yield ≥380 MPa Elongation ≥15% Hardness 179–207 HB (Spheroidized Annealed) Hardness 61–65 HRC (Quenched & Tempered)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–200 mm ID Range: 2–180 mm Wall Thickness: 1.0–20 mm Length: 10–6000 mm Dimensional Tolerance: ±0.005–±0.03 mm Custom CNC Machining Services Available	C 0.95–1.05, Si≤0.40 Mn 0.20–0.40, Cr 1.30–1.65, P≤0.025, S≤0.025
H13 Hot Work Tool Steel	ASTM H13 EN 1.2344 GB 4Cr5MoSiV1	Tensile ≥1600 MPa Yield ≥1200 MPa Elongation ≥10% Hardness 48–52 HRC (Quenched & Tempered)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 5–200 mm ID Range: 3–180 mm Wall Thickness: 2.0–20 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.32–0.45, Si 0.80–1.20 Mn 0.20–0.50, Cr 4.75–5.50, Mo 1.10–1.75, V 0.80–1.20, P≤0.030, S≤0.030
P20 Plastic Mold Steel	ASTM P20 EN 1.2311 GB 3Cr2Mo	Tensile ≥980 MPa Yield ≥785 MPa Elongation ≥12% Hardness 28–32 HRC (Pre-hardened & Tempered)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 5–200 mm ID Range: 3–180 mm Wall Thickness: 2.0–20 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C 0.28–0.40, Si 0.20–0.80 Mn 0.60–1.00, Cr 1.40–2.00, Mo 0.30–0.55, P≤0.030, S≤0.030
304 Stainless Steel	UNS S30400 EN 1.4301 GB 06Cr19Ni10	Tensile ≥515 MPa Yield ≥205 MPa Elongation ≥40% Corrosion Resistant Hardness ≤187 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 2–250 mm ID Range: 1–230 mm Wall Thickness: 0.5–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.005–±0.05 mm Custom CNC Machining Services Available	C≤0.08, Cr 18.0–20.0 Ni 8.0–11.0, Mn≤2.0, P≤0.045, S≤0.030
316 Stainless Steel	UNS S31600 EN 1.4401 GB 06Cr17Ni12Mo2	Tensile ≥515 MPa Yield ≥205 MPa Elongation ≥40% Superior Corrosion Resistant Hardness ≤187 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 2–250 mm ID Range: 1–230 mm Wall Thickness: 0.5–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.005–±0.05 mm Custom CNC Machining Services Available	C≤0.08, Cr 16.0–18.5 Ni 10.0–14.0, Mo 2.0–3.0, Mn≤2.0, P≤0.045, S≤0.030
304L Low Carbon Stainless Steel	UNS S30403 EN 1.4306 GB 022Cr19Ni10	Tensile ≥485 MPa Yield ≥170 MPa Elongation ≥40% Intergranular Corrosion Resistant Hardness ≤187 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 2–250 mm ID Range: 1–230 mm Wall Thickness: 0.5–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.005–±0.05 mm Custom CNC Machining Services Available	C≤0.03, Cr 18.0–20.0 Ni 8.0–12.0, Mn≤2.0, P≤0.045, S≤0.030
316L Low Carbon Stainless Steel	UNS S31603 EN 1.4404 GB 022Cr17Ni12Mo2	Tensile ≥485 MPa Yield ≥170 MPa Elongation ≥40% Superior Intergranular Corrosion Resistant Hardness ≤187 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 2–250 mm ID Range: 1–230 mm Wall Thickness: 0.5–25 mm Length: 10–6000 mm Dimensional Tolerance: ±0.005–±0.05 mm Custom CNC Machining Services Available	C≤0.03, Cr 16.0–18.5 Ni 10.0–15.0, Mo 2.0–3.0, Mn≤2.0, P≤0.045, S≤0.030
17-4PH Precipitation Hardening Stainless Steel	UNS S17400 EN 1.4542 GB 05Cr17Ni4Cu4Nb	Tensile ≥1310 MPa Yield ≥1170 MPa Elongation ≥10% Hardness 42–44 HRC (H900 Precipitation Hardened)	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 3–200 mm ID Range: 2–180 mm Wall Thickness: 1.0–20 mm Length: 10–6000 mm Dimensional Tolerance: ±0.01–±0.05 mm Custom CNC Machining Services Available	C≤0.07, Cr 15.5–17.5 Ni 3.0–5.0, Cu 3.0–5.0, Nb 0.15–0.45, Mn≤1.0, Si≤1.0, P≤0.040, S≤0.030
Q355B Low Alloy High Strength Steel	GB Q355B ASTM A572 Gr.55 EN S355JR	Tensile ≥470 MPa Yield ≥355 MPa Elongation ≥21% Hardness 140–190 HB	CNC Machinable Shapes: Custom Precision Bore, Custom OD Profile, Internal/External Threads, Grooves, Tapers, Stepped Sections, Complex Contoured Tube OD Range: 5–300 mm ID Range: 3–280 mm Wall Thickness: 2.0–30 mm Length: 10–6000 mm Dimensional Tolerance: ±0.02–±0.08 mm Custom CNC Machining Services Available	C≤0.24, Si≤0.55 Mn≤1.60, P≤0.035, S≤0.035

Note: If you do not find a CNC Machined Special Steel Tube that meets your requirements or is suitable for your customer’s project, please contact our manager sales consultant (Email: stsalesman4@stmetal001.com) and send us your specifications and technical parameter files to obtain Customized quotation plan.

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Factory

Q: What types and standards of carbon steel do you mainly supply?

A: We mainly supply a wide range of carbon steel products including seamless and welded steel pipes, steel plates, coils, and bars. Common carbon steel grades include A36, A106, A53, API 5L, and S355, which are widely used in construction, machinery, and pipeline engineering. All carbon steel products comply with international standards such as ASTM, API, EN, and JIS. We can also provide corresponding material test certificates (MTC) and support customized specifications according to customer project requirements.

Q: Can you provide special specifications or non-standard customization? For example, extra-wide plates or pipes with specific wall thicknesses?

A: Of course. One of our advantages is our flexible customization capabilities. We can provide customized size cutting, special thicknesses, and special surface treatments (such as 2B, BA, No.4 brushed finish, mirror finish) based on your drawings or requirements. Whether it's a small trial order or a large-volume purchase, we can meet your needs.

Q: How do you guarantee the quality and consistency of materials? Do you have quality certifications?

A: Quality is our lifeline. We use direct supply from large steel mills to ensure material traceability. Each shipment comes with a Material Quality Certificate (MTC). We have our own quality control team that conducts random checks on material composition, dimensional tolerances, surface finish, and mechanical properties. Our factory is also ISO 9001:2015 quality management system certified.

Q: What are your delivery times and logistics solutions for overseas customers?

A: For standard-specification in-stock products, we can complete preparation and shipment within 7-14 days. Delivery times for customized products will be determined through negotiation based on the specific process. We have established international logistics partners who can arrange full container load (FCL), less-than-container load (LCL), or air freight according to your needs, and provide various trade terms such as EXW, FOB, CIF, and DDP, with door-to-door service.

Q: As a new customer, how do I begin cooperation? Can you provide samples for testing?

A: The cooperation process is very smooth: 1) You provide specific requirements (brand, specifications, quantity, standards); 2) We provide a quotation and technical advice; 3) After confirmation, we arrange the contract and payment; 4) Production/pickup and quality inspection; 5) Shipment and provision of documentation. We encourage sample testing. For serious customers, we can provide small-size samples to ensure that the materials fully meet your processing and application requirements.

Why Choose Us
Over 20 years of experience in steel manufacturing, offering a comprehensive product range and one-stop supply solutions. Committed to long-term cooperation and reliable service for global partners.
Production & Quality Control
Stable production capacity supported by an experienced technical team. Strict quality management with ISO-compliant inspections and optional third-party testing (SGS, TÜV, CE).
Packing & Shipping
Flexible and secure packaging tailored to product type and customer requirements. Fast and reliable delivery with standard stock in 2 weeks and custom orders scheduled per specifications.
Certificate & Compliance
ISO9001 certified with full support for international standards. We provide material certificates (MTC) and third-party inspections to ensure compliance and customer confidence.

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Shengtao Metal Material

Tel: +86 -18351580831
Email: stsalesman3@stmetal001.com
Add.: No. 111 Xishi Road, Wuqin Village, Luoshe Town, Huishan District, Wuxi City, Jiangsu Province,China

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