Böhler FOX CM 2 Kb E9018-B3 2.25Cr-1Mo Electrode

E9018-B3 electrode for 2.25Cr-1Mo steel in refineries and power plants

The Böhler FOX CM 2 Kb is a basic-covered, core-wire-alloyed stick electrode for 2.25 % Cr, 1 % Mo steels, classified AWS A5.5 E9018-B3 H4R and EN ISO 3580-A E CrMo2 B 4 2 H5. Böhler Welding lists it as approved for long-term exposure up to 1112 °F service temperature and applicable to welds in refineries, boiler construction and thermal power plants. The deposit is described as crack resistant and ductile with high creep rupture strength and low hydrogen (HD below 4 ml per 100 g), good weldability in all positions except vertical-down, and metal recovery of about 110 %. The deposit is nitridable and heat treatable.

Technical specifications

Parameter	Specification
AWS classification	A5.5 / SFA-5.5 E9018-B3 H4R; A5.5M E6218-B3 H4
EN ISO classification	3580-A E CrMo2 B 4 2 H5; 3580-B E6218-2C1M H5
Typical analysis, wt %	C 0.08; Si 0.3; Mn 0.7; Cr 2.2; Mo 1.0; P up to 0.010; Sb up to 0.005; Sn up to 0.006; As up to 0.005
Tempered at 1274 °F for 1 h (T1)	Yield 87 ksi (minimum 77); tensile 102 ksi (minimum 90); elongation 22 % (minimum 18); 125 ft-lbs at 68 °F (minimum 35)
Tempered 1346 °F / 2 h (T2)	Yield 81 ksi (minimum 58); tensile 96 ksi (minimum 73); elongation 21 % (minimum 18)
Quenched and tempered (QT)	Yield 70 ksi (minimum 58); tensile 87 ksi (minimum 73); elongation 21 %; 133 ft-lbs at 68 °F
Polarity	DC+
Sizes and current	3/32 in x 10 in: 80 to 110 A; 1/8 in x 14 in: 100 to 140 A; 5/32 in x 14 and 18 in: 130 to 180 A; about 3/16 in x 18 in: 180 to 230 A
Redrying	525 to 625 °F, 2 h
Preheat and interpass	390 to 660 °F; post-weld annealing 1290 to 1380 °F for at least 1 h, furnace cool to 572 °F, then still air
Approvals	TÜV (00722), DB (10.014.81), ABS, DNV, CE

Parent steels and where it fits

The data sheet lists high-temperature steels and similarly alloyed cast steels, quenched and tempered steels of similar alloy up to 140 ksi tensile strength, case-hardening and nitriding steels, among them 10CrMo9-10, 10CrMo11, 16CrMo9-3, 11CrMo9-10, G17CrMo9-10 and G19CrMo9-10, and ASTM A 182 F22, A 213 T22, A 234 WP22, A 335 P22, A 336 F22 and A 426 CP22. Choose it for P22 piping, superheater and header joints and hydroprocessing equipment where the code asks for matching chemistry. For the lighter 1.25Cr-0.5Mo grades use the

FOX DCMS Kb.

, and for P91 the

Thermanit Chromo 9 V mod.

. Alloy electrodes must be kept separate from carbon steel consumables, because mix-ups are hard to detect after welding.

Related Böhler Welding electrode	Classification (AWS A5.1 / A5.5 / A5.4)	Typical use
FOX EV 50	E7018-1 H4R	Mild and fine-grain steel, boiler, tank and offshore work
FOX DCMS Kb	E8018-B2 H4	1 % Cr, 0.5 % Mo boiler, plate and tube steel
Thermanit Chromo 9 V mod	E9015-B91 H4	Grade 91 (9Cr-1Mo-V-Nb) creep-strength steel
FOX NiMo	E10018-D2	Cast steel, valves and oil tools

Heat treatment and what to confirm

The preheat range, interpass limits and annealing cycle quoted above are the data sheet guidance; the procedure qualification for the actual wall thickness decides the final values. The low limits on phosphorus, antimony, tin and arsenic in the analysis are relevant if step-cooling or temper-embrittlement tests are in the specification, so state this in the enquiry together with the diameter, pack type, quantity and certificate level.

Documents and quotation

Attached: the manufacturer data sheet for FOX CM 2 Kb, which is the source of every figure on this page. More products of this kind are collected in welding electrodes. Send us the size, packaging, quantity, the steel you are welding and the certificate you expect, and we will prepare the offer.