WUXI S-BLUE STAR CORPORATION.

SEAMLESS CARBON STEEL PIPE/TUBE

SEAMLESS STAINLESS
STEEL TUBE/PIPE

CYLINDER TUBE

PISTON ROD/CHROME BAR

TUBE COMPONENTS

CYLINDER TUBE

A.CHEMICAL COMPOSITION

Supply condition Steel grade	Cold finished(Hard)( BK)		Cold drawn and stress-relieved(BK+S)			Hardness HB
Supply condition Steel grade	Tensile strength MPa	Elongation (%)	Tensile trength MPa	Yield strength MPa	Elongation (%)	Hardness HB
20#	≥550	≥8	≥570	≥470	≥14	175
45#	≥650	≥5	≥600	≥520	≥12	207
St52	≥640	≥5	≥600	≥520	≥15	190
25Mn	≥640	≥5	≥600	≥510	≥15	195
27SiMn	≥840	≥5	≥800	≥720	≥10	230

B.MECHANICAL PROPERTIES

Steel grade	C	Si	Mn	P	S	Cu	Ni	Cr
20#	0.17~0.23	0.17~0.37	0.35~0.65	0.035	0.035	0.25	0.30	0.25
45#	0.42~0.50	0.17~0.37	0.50~0.80	0.025	0.02	0.20	0.25	0.25
25Mn	0.22~0.29	0.17~0.37	0.70~1.00	0.03	0.03	0.20	0.30	0.25
27SiMn	0.24~0.32	1.10~1.40	1.10~1.40	0.035	0.035	0.30	0.30	0.30

Steel grade	C	Si	Mn	P	S	V	Nb	Ti	Al
ST52	<0.18	<0.55	1.00~1.60	0.03	0.03	0.02~0.15	0.015~0.06	0.02~0.20	0.015

C. OTHER TECHNICAL PARAMETERS
WELDABILITY
STEEL GRADES HAVE A VERY GOOD WELDABILITY ACCORDINGLY TO THE
COMMON WELDING SYSTEM.(CARBON EQUIVALENT 0.45)
TOLERANCES
1、OUTER DIA
< 40 mm +/-0.2mm
FROM 40 TO 100 mm +/-0.3mm
>100mm +/-0.5mm
2、WALL THK
<120mm OD +/-5%
>120mm +/-7.5%
3. STRAIGHTNESS 1/1000 OF THE TUBE LENGTH
4. INSIDE HONNED DIA ISO H8
5. ROUGHNESS 0.2~0.4u
6. LENGTHS
LENGTH<500 +2mm
500<LENGTH<=2000 +3mm
2000<LENGTH<5000 +5mm
5000<LENGTH<7000 +10mm
TUBE ENDS
TUBE ENDS SHALL BE CUT NOMINALLY SQUARE TO THE
TUBE AXIS AND SHALL BE FREE FROM THE EXCESSIVE BURRS.

WUXI S-BLUE STAR CORPORATION. ADD:#701,NO.2 DONGTING MIDDLE ROAD,XISHAN DISTRICT,WUXI,JIANGSU,CHINA.
TEL:0086-510-88709135　 FAX:0086-510-88217970　 E-mail:sales@sbstube.com
ICP：05065301 　 webdesign by juntong.net