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CITON HYDRAULIC

High-Strength Seamless Steel Tubes

Seamless steel tubes with selected high-strength material grades.

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Technical Specifications

High-Strength Seamless Steel Tubes

Seamless steel tubes with selected high-strength material grades.

Product suitability, material grade, dimensions and delivery requirements should be confirmed against your drawing or specification.

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AI-generated product illustration supplied for preview; not a verified CITON product photograph. Additional verified angles remain pending.

Technical Specifications

Technical values use the user-confirmed 20#/45# values and original source data for 27SiMn/Q355E.

Chemical Composition

Steel Grade	Quality Grade	C ≤	Si ≤	Mn ≤	P ≤	S ≤	Nb ≤	V ≤	Ti ≤	Cr ≤	Ni ≤	Cu ≤	N ≤	Mo ≤	B ≤	Al ≥
Q390	A	0.20	0.50	1.70	0.035	0.035	0.07	0.20	0.20	0.30	0.50	0.20	0.015	0.10	—	—
Q390	B	0.20	0.50	1.70	0.035	0.035	0.07	0.20	0.20	0.30	0.50	0.20	0.015	0.10	—	—
Q390	C	0.20	0.50	1.70	0.030	0.030	0.07	0.20	0.20	0.30	0.50	0.20	0.015	0.10	—	0.015
Q390	D	0.20	0.50	1.70	0.030	0.025	0.07	0.20	0.20	0.30	0.50	0.20	0.015	0.10	—	0.015
Q390	E	0.20	0.50	1.70	0.025	0.020	0.07	0.20	0.20	0.30	0.50	0.20	0.015	0.10	—	0.015
Q420	A	0.20	0.50	1.70	0.035	0.035	0.07	0.20	0.20	0.30	0.80	0.20	0.015	0.20	—	—
Q420	B	0.20	0.50	1.70	0.035	0.035	0.07	0.20	0.20	0.30	0.80	0.20	0.015	0.20	—	—
Q420	C	0.20	0.50	1.70	0.030	0.030	0.07	0.20	0.20	0.30	0.80	0.20	0.015	0.20	—	0.015
Q420	D	0.20	0.50	1.70	0.030	0.025	0.07	0.20	0.20	0.30	0.80	0.20	0.015	0.20	—	0.015
Q420	E	0.20	0.50	1.70	0.025	0.020	0.07	0.20	0.20	0.30	0.80	0.20	0.015	0.20	—	0.015
Q460	C	0.20	0.60	1.80	0.030	0.030	0.11	0.20	0.20	0.30	0.80	0.20	0.015	0.20	0.005	0.015
Q460	D	0.20	0.60	1.80	0.030	0.025	0.11	0.20	0.20	0.30	0.80	0.20	0.015	0.20	0.005	0.015
Q460	E	0.20	0.60	1.80	0.025	0.020	0.11	0.20	0.20	0.30	0.80	0.20	0.015	0.20	0.005	0.015
Q500	C	0.18	0.60	1.80	0.025	0.020	0.11	0.20	0.20	0.60	0.80	0.20	0.015	0.20	0.005	0.015
Q500	D	0.18	0.60	1.80	0.025	0.015	0.11	0.20	0.20	0.60	0.80	0.20	0.015	0.20	0.005	0.015
Q500	E	0.18	0.60	1.80	0.020	0.010	0.11	0.20	0.20	0.60	0.80	0.20	0.015	0.20	0.005	0.015
Q550	C	0.18	0.60	2.00	0.025	0.020	0.11	0.20	0.20	0.80	0.80	0.20	0.015	0.30	0.005	0.015
Q550	D	0.18	0.60	2.00	0.025	0.015	0.11	0.20	0.20	0.80	0.80	0.20	0.015	0.30	0.005	0.015
Q550	E	0.18	0.60	2.00	0.020	0.010	0.11	0.20	0.20	0.80	0.80	0.20	0.015	0.30	0.005	0.015
Q620	C	0.18	0.60	2.00	0.025	0.020	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015
Q620	D	0.18	0.60	2.00	0.025	0.015	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015
Q620	E	0.18	0.60	2.00	0.020	0.010	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015
Q690	C	0.18	0.60	2.00	0.025	0.020	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015
Q690	D	0.18	0.60	2.00	0.025	0.015	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015
Q690	E	0.18	0.60	2.00	0.020	0.010	0.11	0.20	0.20	1.00	0.80	0.20	0.015	0.30	0.005	0.015

Mechanical Properties

Steel grade	Tensile strength Rm (MPa)	Yield strength ≤16 mm (MPa)	Yield strength >16–30 mm (MPa)	Yield strength >30 mm (MPa)	Source
Q390	490–650	390	370	350	Company brochure, page 13
Q420	520–680	420	400	380	Company brochure, page 13
Q460	550–720	460	440	420	Company brochure, page 13
Q500	610–770	500	480	440	Company brochure, page 13
Q550	670–830	550	530	490	Company brochure, page 13
Q620	710–880	620	590	550	Company brochure, page 13
Q690	770–940	690	660	620	Company brochure, page 13

Product features

Designed for order-specific requirements

Material, dimensions and tolerances follow the applicable source table when confirmed.
Share drawings, quantity and destination for a product-specific quotation.
Pending material records remain excluded from verified public values.

Applications

Hydraulic and industrial equipment

Typical application suitability depends on the final design, operating conditions, material grade and customer specification.

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High-Strength Seamless Steel Tubes

High-Strength Seamless Steel Tubes

Technical Specifications

Chemical Composition

Mechanical Properties

Designed for order-specific requirements

Hydraulic and industrial equipment

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