CK45 SRB Honed Tube

CK45 SRB Honed Tube

High Material Grade

C20   CK45   ST52   25Mn   27SiMn Seamless steel

 

 

Well Mechanical Properties

Tensile strength>600 N/mm²  Yield strength>520 N/mm²  Elongation>15%  Hardness>200HB

 

Wide-range spec

OD: 40--500 mm    ID:25--400 mm  Wall thickness: 3--50 mm  Length: 30--8000 mm

 

High precision

Straightness<0.2 mm/1000mm    Roughness Ra<0.2 um    Tolerance: H8

 

International Standard & Certificate 

API    ASTM    BS    DIN    EN    GB    JIS

ISO9001  TS16949

Our Services

 

      1. Price: FOB Shanghai or CIF & CFR Price.

2. Delivery time: within 30 days.

3. Packing: Plastic cloth pakage with Bundle. Both end caps.

4. Marking: on request.

5. Mill MTC: Certificate stamped by Mill’s inspection Authority.

6. Payment: 30% advance and balance again BL copy.

7. Negotaiable Documents: One set of commercial Invoice, Packing list. Bill of Lading, Mill Test Certificate. CO.

8. Trade Assurance order is welcomed.Chemical Composition

Steel Grade	C	SI	Mn	P	S	Cr	Ni	Cu
20#	0.17-0.24	0.17-0.37	0.35-0.65	0.035	0.035	0.250	0.250	/
45#	0.42-0.50	0.17-0.37	0.50-0.80	0.035	0.035	0.250	0.300	/
Q345B	≤0.2	≤0.5	1.00-1.60	0.030	0.030	0.300	0.250	0.08
Q345D	≤0.2	≤0.5	1.00-1.60	0.030	0.030	0.250	0.250	0.15
25Mn	0.22-0.29	0.17-0.37	0.70-1.00	0.035	0.035	/	/	/
27SiMn	0.22-0.32	1.10-1.40	1.10-1.40	0.035	0.035	0.300	0.300	/
E355	≤0.2	≤0.55	≤1.6	0.025	0.025	0.250	0.250	/
SAE1026	0.22-0.28	0.15-0.35	0.60-0.90	0.040	0.050	/	/	/

Steel Grade	Rm Mpa	ReH Mpa	Elonggation	cold finished Rm Mpa	cold finished Elonggation
20#	≥520	≥375	≥15	≥550	≥8
45#	≥600	≥520	≥10	≥640	≥5
16Mn(Q345B /D)	≥600	≥520	≥14	≥640	≥5
25Mn	≥600	≥510	≥15	≥640	≥5
27SiMn	≥760	≥610	≥10	≥800	≥5
St45	≥520	≥375	≥15	≥550	≥5
E355(st52)	≥600	≥520	≥14	≥640	≥5
SAE1026	≥600	≥510	≥15	≥640	≥5

 Technique and tolerance:                            

Working method	range	ID	H8	H9	H10
cold drawn	25-250	30-50	+0.0390	+0.0620	+0.1000
cold rolling	25-150	50-80	+0.0460	+0.0740	+0.1200
cold drawn-honed	40-250	80-120	+0.0540	+0.0870	+0.1400
cold drawn-SRB	50-250	120-180	+0.0630	+0.1000	+0.1600
cold drawn -polished	40-250	180-250	+0.0720	+0.1150	+0.1850
cold drawn-polish-SRB	50-250	as required	as required	as required	as required