FAS-NT / FAS-NS

FAS-NT                                                                                                   FAS-NS
Wear resistant round link chains.                                                            Wear resistant round link chains.
Case hardened, technical.                                                                      Case hardened, special.

Application                                                                                             Application
Used in equipment for which high wear resistance                               Used in conditions for which both high wear
of chains is required.                                                                              resistance and relatively high strength properties
                                                                                                               are required.

Mechanical properties
Mechanical properties of case hardened chains depend on the carburizing depth. The depth can reach up to max. 14% of bar diameter. The deeper the carburizing, the smaller breaking force is observed. The unit elongation at breaking force is only 1.5 ÷ 3%.

**Depending on carburizing depth, the chains are manufactured in two group types:**
group A total carburizing depth within the range: (9 ÷ 7%) d (0.09 ÷ 0.07) × d	group B total carburizing depth within the range: (14 ÷ 10%) d (0.14 ÷ 0.10) × d

(d - chain diameter)

The surface hardness of case-hardened chains is ca. 800 HV (64 HRC). The hardness of the core (beyond the carburizing level) in FAS-NS chains is min. 400 HV (380 HBW; 40.8 HRC) – 5% decrease in hardness is acceptable – its value is two times higher than the core hardness of FAS-NT chains, which is min. 200 HV (190 HBW) – 5% decrease in hardness is acceptable.

Due to production technology, the case-hardened chains are hard and brittle. An equipment designer should take into account the maximum (the highest possible) safety factor value for working load limit (WLL) in the kinematic and dynamic system Improper use of chain (exceeding WLL) may cause chain breaking in a brittle manner with link falling into small pieces. Their significant force may jeopardize the safety and health of workers who are in the immediate vicinity of the chain operation area.

Case-hardened chains can be loaded only with a force that is longitudinal to the chain axis. It is unacceptable to:

· weld any elements to chain links,

· load the chain links with a lateral force that spreads the link from the inside or load them with a compressive force that acts from the outside,

· load the chain links with impact forces, strokes.

**Stress at breaking force based on carburizing depth**
Group of case - hardened chains	Total depth	Hardening depth after carburizing	Stress at breaking force
		Hardening depth after carburizing	FAS-NT chain	FAS-NS chain
		[min. 550 HV]	[N/mm² MPa]	[N/mm² MPa]
A	[9÷7%]d	[5÷3%]d	280÷310	400÷450
B	[14÷10%]d	[10÷6%]d	240÷240	350÷400

**Dimensions and mechanical properties**
Chain size d×t(p) [mm]	b1 min. [mm]	b2 min. [mm]	Test force		Breaking force				∼ Weight [kg]
			FAS - NT Group A and B [kN]	FAS - NS Group A and B [kN]	FAS - NT Group A [kN]	FAS - NS Group B [kN]	FAS - NT Group A [kN]	FAS - NS Group B [kN]
			FAS - NT Group A and B [kN]	FAS - NS Group A and B [kN]	FAS - NT Group A [kN]	FAS - NS Group B [kN]	FAS - NT Group A [kN]	FAS - NS Group B [kN]
14×50*1.7	17.0	48.0	52	74	86-95	74-83	123-138	108-123	4.0
16×45*5.8.9.12	19.2	54.4	68	96	113-125	97-109	161-181	141-161	5.7
16×56*4.11	22.0	58.0	68	96	113-125	97-109	161-181	141-161	5.2
16×64*6	20.0	55.0	68	96	113-125	97-109	161-181	141-161	5.1
16×80*2.13	22.4	58.0	68	96	113-125	97-109	161-181	141-161	4.7
18×63*4.11	24.0	65.0	86	122	143-158	122-137	204-229	178-204	6.5
18×64*1.7	21.0	60.0	86	122	143-158	122-137	204-229	178-204	6.6
18×90*2.13	25.0	64.0	86	122	143-158	122-137	204-229	178-204	6.0
19×64.5*1.7	22.0	63.0	95	136	159-176	136-153	227-255	198-227	7.6
19×75*6	22.0	63.0	95	136	159-176	136-153	227-255	198-227	7.1
20×56*5.12	24.0	72.0	105	151	176-195	151-170	251-285	220-251	9.0
20×70*4.11	27.0	72.0	105	151	176-195	151-170	251-285	220-251	8.2
22×86*1.7	26.0	73.0	128	182	213-236	182-205	304-342	266-304	9.5
24×86*1.7	28.0	79.0	152	217	253-280	217-244	362-407	317-362	11.6
24×87.5*1.7	28.0	79.0	152	217	253-280	217-244	362-407	317-362	11.5
26×73*5.12	31.2	94.0	178	255	297-329	255-287	425-448	372-425	15.0
26×91*4.11	35.0	94.0	178	255	297-329	255-287	425-448	372-425	14.0
26×92*1.7	30.0	86.0	178	255	297-329	255-287	425-448	372-425	13.7
26×100*6	31.0	87.0	178	255	297-329	255-287	425-448	372-425	13.3
30×84*5.12	36.0	108.0	238	339	396-438	339-382	565-636	495-565	20.0
30×105*4.11	39.0	108.0	238	339	396-438	339-382	565-636	495-565	19.0
30×108*1.7	34.0	98.0	238	339	396-438	339-382	565-636	495-565	18.0
30×120*6	36.0	102.0	238	339	396-438	339-382	565-636	495-565	17.5
34×126*1.7	38.0	110.0	305	436	508-563	436-490	726-817	636-726	22.7
34×136*6	39.0	113.0	305	436	508-563	436-490	726-817	636-726	22.5
36×101*5.12	43.2	130.0	342	489	570-631	489-550	814-916	713-814	29.0
38×126*6	42.1	121.0	381	544	635-703	544-612	907-1021	794-907	30.1

*1 - DIN 22252, 2 - DIN 762, 3 - DIN 763, 4 - DIN 764, 5 - DIN 766, 6 - FASING Technical Requirements, 7 - PN-G-46701, 8 - PN-G-46732,
9 - DIN 5684, 10 - PN-75/M-84543, 11 - PN-75/M-84541, 12 - PN-75/M-84540, 13 - DIN 20637.

Other sizes and parameters of case-hardened chains available following individual agreements with a customer.