Multi-rifled seamless steel tube

 Multi-rifled seamless steel tube is used as a water wall tube loaded with a highly heated flux and is also expected to find broadened other uses in the viewpoint of iits energy saving effect and higher safety against the overheating damage. This has groove on its inside surface which functions to raise thermal efficiency by distrubing the fluid within the tube, featuring and extremely high thermal conduction property.

Available grades and size range:

Multi-rifled seamless steel tube are produced to meet specific end use requirements, specifications, tolerances and chemistries.

Standard	Grade	Specification
		O.D.(mm)	W.T.(mm)	Number of rib
GB/T 20409-2006	20G 15CrMoG SA-210A1 SA-210C SA-213 T2 SA-213 T12	22-83	4.5-13	4-14

 

Grade and Chemical Composition (%)

Steel Grade	C	Si	Mn	S	P	Cr	Mo
20G	0.17-0.23	0.17-0.37	0.35-0.65	0.015	0.025
15CrMoG	0.12-0.18	0.17-0.37	0.40-0.70	0.015	0.025	0.80-1.10	0.40-0.55
A 210A1 SA-210A1	≤0.27	≥0.10	≤0.93	0.020	0.025
A 210C SA-210C	≤0.35	≥0.10	0.29-1.06	0.020	0.025
A 213 T2 SA-213 T2	0.10-0.20	0.10-0.30	0.30-0.61	0.020	0.025	0.50-1.81	0.44-0.65
A 213 T12 SA-213 T12	≤0.15	≤0.50	0.30-0.61	0.020	0.025	0.80-1.25	0.44-0.65

 

Typical Mechanical Properties

Inside the water wall pipes of boilers in sub-critical steam power plants, water boils into steam vapor.

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Grade	Condition	Tensile strength	Yield stength	Elongation
		Mpa(min)	Mpa(min)	%(min)
1020	CW	414	483	5
	SR	345	448	10
	A	193	331	30
	N	234	379	22
1025	CW	448	517	5
	SR	379	483	8
	A	207	365	25
	N	248	379	22
4130	SR	586	724	10
	A	379	517	30
	N	414	621	20
4140	SR	689	855	10
	A	414	552	25
	N	621	855	20

Technical Specifications:

• ASME SA192, SA209, SA210, SA213, EN 10216, DN 17175, BS 3059, JIS 3461,JIS 3462.
• Type: Type A, Type B, and Optimized Type.
• Manufacturing method: Cold-drawn.
• Delivery Conditions: Normalized and Tempered.

Rifled tube

The rifled tube is used as a water wall tube loaded with a highly heated flux and is also expected to find broadened other uses in the viewpoint of its energy-saving effect and higher safety against overheating damage.

The rifled tube has a groove on its inside surface that functions to raise thermal efficiency by disturbing the fluid within the tube, featuring an extremely high thermal conduction property.