EN 10297 Mechanical seamless Tubes

EN 10297 Seamless circular steel tubes for mechanical and general engineering purposes. Technical delivery conditions. Non-alloy and alloy steel tubes.
Standard: BS EN 10297-1:2003

Applications of  EN10297:

Alloy and non-alloy steel pipes, with circular section for mechanical and engineering applications.

Process: Seamless

Tolerance and size range :

Outside diameter:
D<=219.1mm: +/-1%(Min+/-0.5mm)
D>219.1mm:+/-1%

Thickness:
D<=219.1mm:+/-12.5%(min +/-0.4mm)
D>219.1mm: itchanges according to the ratio thickness/ diameter

Tolerance on thickness related to t/CD:

<=0.025	0.025<T<=0.050	>0.050
+/- 20%	+/-15%	+/-12.5%

Size range: According to DIN_EN_10220-2003 unless differently spcified by the customer

Straightness

D<33.7mm :not specified
D>=33.7mm :0.15% on the total length

Note:

D: Outside diameter
T: Nominal thickness (mm)

Out of proundness

Included in the outside diameter tolerance

Standard and Steel grade:

• EN 10297 E235
• EN 10297 E355
• EN 10297 C35E
• 20MnV6

Certification: UNI EN10204.3.1

Chemical analysis [%] of  EN 10297:

Steel grade	C	Si	Mn	P	S
E235	≤0,17	≤0,35	≤1,20	≤0,040	≤0,045
E355	≤0,22	≤0,55	≤1,60	≤0,040	≤0,045
C35E	0,32 – 0,39	≤0,40	0,50 – 0,80	≤0,035	≤0,035
20MnV6	0,16 – 0,22	0,10 – 0,50	1,30 – 1,70	≤0,035	≤0,040

Mechanical properties of EN 10297:

Steel grade	Supply condtion	ReH min [MPa]		Rm min [MPa]		A [%]
		T≤16	16<T≤25	T≤16	16<T≤25
E235	AR	235	225	360	360	25
E355	AR	355	345	490	490	20
C35E	N	300	280	520	500	17
20MnV6	AR	470	450	650	620	17

Condition on delivery:

Term	Symbol	Explanation
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

API Spec 5CT Casing and Tubing

API Spec 5CT Casing and Tubing

api 5ct, API 5CT J55, API 5CT K55, API 5CT L80, API 5CT N80, API 5CT P110, API SPEC 5CT, casing, steel pipes, Tubing

API Spec 5CT Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

The main steel grade of API 5CT:

• API 5CT J55
• API 5CT K55
• API 5CT N80
• API 5CT L80
• API 5CT P110

Casing pipe end thread type

The International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain end casing liners and pup-joints) and accessories. It is applicable to the following connections in accordance with ISO 10422 or API Spec 5B:

- short round thread casing (STC);
- long round thread casing (LC);
- buttress thread casing (BC);
- extreme-line casing (XC);
- non-upset tubing (NU);
- external upset tubing (EU);
- integral joint tubing (IJ).

For such connections, this International Standard specifies the technical delivery conditions for couplings and thread protection.
For pipes covered, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined.
It may also be applied to tubulars with connections not covered by ISO/API standards.

Chemical Compositions(%) of API 5CT

Grade	C≤	Si≤	Mn≤	P≤	S≤	Cr≤	Ni≤	Cu≤	Mo≤	V≤	Als≤
API 5CT J55	0.34-0.39	0.20-0.35	1.25-1.50	0.020	0.015	0.15	0.20	0.20	/	/	0.020
API 5CT  K55	0.34-0.39	0.20-0.35	1.25-1.50	0.020	0.015	0.15	0.20	0.20	/	/	0.020
API 5CT N80	0.34-0.38	0.20-0.35	1.45-1.70	0.020	0.015	0.15	/	/	/	0.11-0.16	0.020
API 5CT  L80	0.15-0.22	1.00	0.25-1.00	0.020	0.010	12.0-14.0	0.20	0.20	/	/	0.020
API 5CT J P110	0.26-035	0.17-0.37	0.40-0.70	0.020	0.010	0.80-1.10	0.20	0.20	0.15-0.25	0.08	0.020

Mechanical Properties of API 5CT

Steel Grade	Yield Strength (Mpa)	Tensile Strength (Mpa)
API 5CT J55	379-552	≥517
API 5CT K55	≥655	≥517
API 5CT N80	552-758	≥689
API 5CT L80	552-655	≥655
API 5CT P110	758-965	≥862

For pipes covered by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined.