New Materials Urea Grade 310 Moln/S31050/1.4466/ASTM A240 Stainless Steel Round Rod for Decomposers 725ln Bar

• Customization: Available
• Type: Alloy Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB
• Model NO.: 725LN Rod/Bar
• Composition: Other
• Technique: Forged
• Shape: Bar
• Surface Treatment: Color Coated
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel
• Application: Tool Steel Bar
• Key Words: 725ln Bar/Rod
• Thickness: 2mm - 100mm
• Outside Diameter: 4.0 - 1219mm
• Length: as Your Requirments
• Diameter Tolerance: H9, H11, H13, K9, K11, K13 etc
• Sample: Free-Sample
• Surface: Lack, Peeled, Polishing, Bright, Sand Blast, Hl
• MOQ: 100kgs
• Stock: in Stock
• Transport Package: Wooden Package
• Specification: 725LN
• Trademark: LORK
• Origin: China
• HS Code: 7219350000
• Production Capacity: 50000kg/Month

Product Description

Product Description

Introduction

Stainless steel grade 725LN(310 MoLN) is a fully austenitic stainless steel that does not have intermetallic phases such as intergranular carbide precipitations. The 725LN(310 MoLN) steel grade has an optimized chemical composition designed specifically for applications in urea plants. The nitrogen in the chemical composition helps to stabilize and strengthen the austenitic phase. This material provides improved corrosion-resistance in urea carbamate environments such as high-pressure strippers.

Chemical Composition
The chemical composition of stainless steel grade 725LN(310 MoLN) is outlined in the following table.

Element	Content (%)
Iron, Fe	Balance
Chromium, Cr	24-26
Nickel, Ni	21-23
Molybdenum, Mo	2-2.50
Manganese, Mn	≤ 2
Nitrogen, N	0.10-0.16
Silicon, Si	≤ 0.70
Phosphorous, P	0.025
Carbon, C	≤ 0.020
Sulfur, S	≤ 0.010

 

Grade Specification

Grade	UNS	DIN	EN	AMS	ASTM		JIS
725LN(310 MoLN)	S31050	-	1.4466	-	ASTM A240		-

Other UREA grade

EURONORM/DIN	WERKSTOFF NR.	AISI	UNS	BRAND NAME
X2 CrNiMo 18-14-3	1.4435	316LUG	S31603	316L MOD UREA  3R60 UREA GRADE
X1 CrNiMoN 25-22-2	1.4466/1.4465	310 MoLN	S31050	25.22.2
	1.4477		S32906	DMV 29.7

Characteristic
 

• Excellent resistance to corrosion in ammonium carbamate
• Excellent resistance to intergranular corrosion
• High resistance to pitting and crevice corrosion
• Good weldability

General corrosion

• S31050 was originally developed for stripper tubes used in the production of urea.
• S31050 has excellent corrosion resistance in urea/carbamate solutions at high pressures andtemperatures.
• S31050 is also highly resistant to inorganic acids

Intergranular corrosion

• S31050 ishighly resistant to intergranular corrosion after welding.

Pitting and crevice corrosion

• S31050 has very good resistance to pitting, and is also far more resistant to crevice corrosion than ASTM 316L.

Stress corrosion cracking (SCC)

• Conventionalausteniticstainless steels of type ASTM 304 and 316 are susceptible to stress corrosion cracking (SCC) in chloride- bearing solutions at temperatures exceeding about 60°C (140°F). The higher nickel content makes S31050 slightly more resistant

Erosion corrosion

• The good mechanical strength of S31050 makes it resistant to erosion-corrosion. Ferrules for urea strippers are oneapplicationwhere this property is utilised.

Weldability

• Theweldability of S31050 is good. Welding must be carried out without preheating, and normally there is noneed for any subsequent heat treatment.
• S31050 has lowthermal conductivity and high thermal expansion.

Mechanical Properties

The mechanical properties of stainless steel grade 725LN(310 MoLN) are displayed in the following table.

Properties	Metric	Imperial
Tensile strength	540-740 MPa	78320- 107327 psi
Proof strength	250 MPa	36259 psi
Modulus of elasticity (20°C)	195 GPa	28282 ksi
Elongation at break (In 2", 50% cold worked)	40%	40%
Hardness, Brinell	95	95

Applications

• Striper Tubes
• Outerlayer of bimetallic
• Ferrules
• Carbamate Condensers
• Decomposers
• Reactor Coils

 

Surface Treatment

Process

Main Applications

 

 

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