Prior Steel Tube & Pipe Manufacturing

Website

Prior Steel Tube & Pipe Manufacturing Hone tube, chrome plated hone tube, chrome bar

Producing high precision cold-drawn seamless hydraulic steel tube, EN10305-1, EN10305-4, E235+N, E355+N, DIN2391/c, St37.4, St52, NBK
ASTM A213, ASTM A269, TP316L, bright annealing, annealed & pickled tube.

03/09/2026

🔛 f7, chrome plated bar, steel 4140(42CrMo), Φ38mm*6000Length

🔛 Grinding & polishing the bar on the centerless grinder

🔻 we have 15sets centerless grinder, can produce:
🔻 minimum dia to Φ8mm, Φ10mm, Φ12mm
🔻 max dia to Φ380mm, Φ390mm, Φ420mm
🔻 Max length to 16-meter

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

02/09/2026

❇️ f7, chrome plated bar(piston rod)
🔻Steel grade: Steel 1045(C45), 42CrMo(4140), 20MnV6, stainless steel
🔻Minimum size Φ8mm, Φ10mm, Φ12mm
🔻Max Φ380mm, Φ390mm, Φ420mm
🔻Max length to 16-meter
🔻Do quenching & tempering
🔻Chrome thickness: 0.025-0.035mm

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

01/09/2026

🟢 EN10305-1, E355+SR', H8, Hone Tube, 60*70
🔹 inner hole honing roughness: ≤0.2μm
🔹 Straightness: 1.0/1000mm
🔹 Tensile: ≥580N/mm²
🔹 Yeild Strength: ≥520N/mm²
🔹 E.L(A5): ≥12%

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

31/08/2026

🟣 EN10305-1, E355+SR', H8, Chrome Plated Bar, ID30mm * OD40mm
🟢 inner hole roughness measured data: 0.146μm, 0.145 μm

🔹inner hole tolerance H8
🔸inner hole roughness: 0.2μm
🔹outside tolerance: f7
🔸outside roughness: 0.2μm
🔹outside chrome plating thickness: 0.03mm
🔸Straightness: 1.0/1000mm
🔹tensile ≥580N/mm², yield strength ≥450N/mm², E.L(A5): ≥10%

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

27/08/2026

‼️Chrome Plated Honed Tube, EN10305-1, E355+SR', H8, 30mm*40mm*Length1000

🔛 Engineer is doing inspection:
🔹inner hole tolerance H8
🔹inner hole roughness: 0.2μm
🔹outside tolerance: f7
🔹outside roughness: 0.2μm
🔹outside chrome plating thickness: 0.03mm
🔹Straightness: 1.0/1000mm
🔹tensile ≥580N/mm², yield strength ≥450N/mm², E.L(A5): ≥10%

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

26/08/2026

🔛 engineer is inspecting the diameter tolerance
🔹 f7, CK45, dia:10mm, quenching & tempering, whole bar hardness: 260HB （26HRC）.
🔸 Chrome thickness: 0.03mm
🔹 Chrome surface hardness: 980-1050HV

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

25/08/2026

f7, CK45, dia:10mm, quenching & tempering, whole bar hardness: 260HB （26HRC）.
Chrome thickness: 0.03mm
Chrome surface hardness: 980-1050HV

💥Sourcing hone tube/cylinder tube, piston rod/chrome plated bar, ready to hone tube professional manufacturer, please contact :
🔗www.prior-machinery.com
📮[email protected]
WhatsApp: +86 180 1912 6206

20/08/2026

🔷 Our workers are making drawing heads for the perforated tubes.
🔷 During the subsequent drawing process, the cold drawn machine can clamp these heads and drawn them outwards.

1️⃣ DIN2391/C, St37.4, St52, NBK
2️⃣ EN10305-1, EN10305-4, E235+N, E355+N
3️⃣ SAE J524, Steel1010
4️⃣ JIS G3445, STKM 11A, 13A, 16A
✅ oiled surface
✅ black phosphate
✅ Cr-6 free zinc plating

💥Sourcing Cold-drawn seamless precision steel tubing professional manufacturer, please contact :
🔗www.prior-tube.com
📮[email protected]
WhatsApp: +86 180 1912 6206

17/08/2026

‼️How does cold-drawn steel tube achieve wall and diameter reduction?

✅ Each reduction operation requires a corresponding set of moulds, consisting of an inner diameter mould and an outer diameter mould.

1️⃣ First Make clamping heads at both ends of the wild tube.
2️⃣ Second, the corresponding inner and outer mould are assembled to the tube to be drawn.
3️⃣ Third, The cold drawing machine clamps one end and pulls it outwards. The resulting tube is the desired size.

💖 For example, if we want a 10*1 tube, and the last size was 13.5*1.2, and we need to draw it to 10*1, then we use a 10mm outer mould and an 8mm inner mould. The drawing process simultaneously reduces the wall and diameter, resulting in a 10*1 tube.

💥Sourcing Cold-drawn seamless precision steel tubing professional manufacturer, please contact :
🔗www.prior-tube.com
📮[email protected]
WhatsApp: +86 180 1912 6206

14/08/2026

🔔 hydraulic precision seamless steel tubing, sent to Komatsu, urgently needed, used for their hydraulic excavator
immediatly use, don't need tube cap

💥Sourcing Cold-drawn seamless precision steel tubing professional manufacturer, please contact:
🔗www.prior-tube.com
📮 [email protected]
WhatsApp: +86 180 1912 6206

Address

Shanghai

Website

, ,

Alerts

Be the first to know and let us send you an email when Prior Steel Tube & Pipe Manufacturing posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Shortcuts

Share

Category