Fertilizer Tubing: Advanced Solutions for Aggressive Conditions: DMV GmbH

From providing the essential nutrients for the growth of our plants and crops to dermataological skin products to the whitening of our smile the fertilizer industry and associated key processes of UREA and ammonia production are an essential ingredient in today’s lives.

Fertilizer production processes present environments with aggressive corrosion conditions, such as with ammonium carbamate production at 180 ºC (356 ºF) to 250 ºC (482 ºF) and 150 bar (15 MPa).

With associated processes such as nitric acid, sulphuric acid, phosphoric acid and melamine production more sophisticated solutions to the use of conventional stainless grades such as 304L/316L are required.

From condensers to cooling towers consideration must be given to the differing types of corrosion presented by the potentially aggressive chemical plant corrosive environments.

Austenitic

DMV designation	Attribute	Nearest equivalent standard			Typical chemical composition ¹⁾						Density		Min. mechanical prop. at RT
		UNS	EN	JIS	C_max	Cr	Ni	Mo	Cu	others			Rp_0.2 Yield Strength		R_m Tensile Strength
											g/cm³	lb/in³	MPa	ksi	MPa	ksi
DMV 304L	Corrosion Resistant	S30403	1.4306	SUS 304L	0.03	19.0	11.0				7.9	0.29	170	25	485	70
DMV 316LUG	Corrosion Resistant	S31603	1.4435		0.02	17.0	13.5	4.5			8.0	0.29	170	25	485	70
DMV 306Si	Corrosion Resistant	S30600	1.4361		0.015	18.0	15.0			Si 4	7.9	0.29	240	35	540	78
DMV 4439	Corrosion Resistant	(S31726)	1.4439		0.03	17.5	13.5	4.5		N 0.16	8.0	0.29	240	35	550	80
DMV 4335	Corrosion Resistant	S31002	1.4335		0.015	25.0	20.5			N<0.10	7.9	0.29	255	37	540	78
DMV 25.22.2	Corrosion Resistant	S31050	1.4466		0.02	25.0	22.0	2.0		N 0.12	7.9	0.29	255	37	540	78
DMV 310S	Corrosion Resistant	S31008	1.4845		0.015	25.0	21.0				7.9	0.29	205	30	515	75
DMV 904	Corrosion Resistant	N08904	1.4539		0.02	20.5	25.5	4.5	1.5		8.0	0.29	215	31	490	71

¹⁾ All figures in weight percentage. In case of order, the limits of the order specification will apply.

Austenitic Ferritic

DMV designation	Nearest equivalent standard		Typical chemical composition ¹⁾						Density		Min. mechanical prop. at RT
	UNS	EN	C_max	Cr	Ni	Mo	Cu	others			Rp_0.2 Yield Strength		R_m Tensile Strength
									g/cm³	lb/in³	MPa	ksi	MPa	ksi
DMV 22.5	S31803	1.4462	0.03	22.0	5.5	3.0		N 0.17 ²⁾	7.8	0.28	450	65	620	90
DMV 25.7N	S32760	1.4501	0.03	25.0	7.0	4.0	0.5	N 0.25; W 0.5 ²⁾	7.8	0.28	550	80	750	109
DMV 29.7	S32906	1.4477	0.03	29.0	7.0	2.3	< 0.80	N 0.35 ²⁾	7.8	0.28	650	94	800	116

¹⁾ All figures in weight percentage. In case of order, the limits of the order specification will apply.
²⁾ Min PRE value controlled.

Nickel Based Alloys

DMV designation	Attribute	Nearest equivalent standard		Typical chemical composition ¹⁾						Density		Min. mechanical prop. at RT
		UNS	EN	C_max	Cr	Ni	Mo	Cu	others			Rp_0.2 Yield Strength		R_m Tensile Strength
										g/cm³	lb/in³	MPa	ksi	MPa	ksi
DMV 928	Corrosion Resistant	N08028	1.4563	0.02	27.0	31.0	3.5	1.2	N 0.10	8.0	0.29	210	31	500	73
DMV 931	Corrosion Resistant	N08031	1.4562	0.015	27.0	31.0	6.5	1.2	N 0.20	8.1	0.29	280	41	650	94
DMV 59	Corrosion Resistant	N06059	2.4605	0.01	23.0	59.0	16.0		Al	8.6	0.31	340	50	690	100
DMV C276	Corrosion Resistant	N10276	2.4819	0.01	16.0	57.0	16.0		W	8.4	0.30	350	51	750	109

¹⁾ All figures in weight percentage. In case of order, the limits of the order specification will apply.

Urea strippers

Carbamate condensers

Tubes: U bent or straight tubes up to 43 m (110 ft) long.

Bimetallic Tubes

Bimetallic tubes were developed as a solution to service some of the most aggressive environments associated with Urea strippers.

Consisting of an external tube of DMV 25.22.2 and internal tube lining of Zirconium grade 702 we innovated our process technology to ensure the integral bonding during the cold working process.

Bimetallic pipes and process pipework in typical dimensions up to 31 mm (1.22”) OD.

cp@dmvtubes.com

Fertilizer